commit cd6cc0be1eeb920b2c99b7962a0d688b27d028d0
Author: Philipp Matthias Schaefer <philipp.matthias.schaefer@posteo.de>
Date:   Wed Dec 22 11:33:30 2021 +0100

    Initial commit

diff --git a/1.data b/1.data
new file mode 100644
index 0000000..c7d277b
--- /dev/null
+++ b/1.data
@@ -0,0 +1,2000 @@
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diff --git a/1.jl b/1.jl
new file mode 100644
index 0000000..f384578
--- /dev/null
+++ b/1.jl
@@ -0,0 +1,14 @@
+include("utils.jl")
+
+input_lines = non_empty_lines("1.data")
+integers = map(s->parse(Int, s), input_lines)
+
+"1"
+zipped = zip(view(integers, 1:length(integers)-1), view(integers, 2:length(integers)))
+result1 = mapreduce(t->t[1] < t[2], +, zipped)
+
+"2"
+zipped2 = zip(view(integers, 1:length(integers)-2), view(integers, 2:length(integers)-1), view(integers, 3:length(integers)))
+summed = map(t->t[1]+t[2]+t[3], zipped2)
+zipped_again = zip(view(summed, 1:length(summed)-1), view(summed, 2:length(summed)))
+result2 = mapreduce(t->t[1] < t[2], +, zipped_again)
diff --git a/10.data b/10.data
new file mode 100644
index 0000000..eec53e5
--- /dev/null
+++ b/10.data
@@ -0,0 +1,94 @@
+({<{({([<<{<[<<><>><<>>](<()()>)><{{{}<>}}<<<>{}>[<>[]]>>}{[<<[]{}>[<>()]>[(()[])]]<{{<><>}[[]<>]}{<
+[(<[[([[(([<{{[]{}}([][])}<<{}[]>([]{})>><{<()()><[][]>}{[()]<()[]>}>]<{({()()}){[{}[]][<>()]}}[{[{}<>]
+{{(<[[(<<<(<<[{}{}]{<>()}><{[]{}}([]{})>>([([][]){{}<>}][<()<>>[(){}]]))<{<(<>())[{}<>]>{{[]{}}<<>{}>}}({<
+<([({[<[(([[<(()<>){[]<>}><<(){}>{()()}>]](<(({}[]){[][]})<{<>())[<>[]]>>{{{()<>}{(){}}}{[<>()]<{}[]>}
+<(((<{<(<{{[[[()<>]{[]()}]][{<()[]><<>{}>}]}}[<{[{[][]}[<><>]]}{{{(){}}[<>()]}{[[]()]{<>[]}}}>{[({{}
+{{({[({(({{[<[{}()]([]<>)><<{}()>[<>[]]>]<<{[]{}}([]<>)>{{<>}{<>{}}}}}{{<<[]<>>{<>()}>}<({[]<>}
+(([{[(<(<[[(([()[]][{}()])(([][])<{}<>>))]]>)[<(<{{<<><>>(<>[])}<([]<>)[[]{}]>}((<{}[]>[<><>]){{[
+{{[<<{<<(<([<<[]()>[[][]]>{[()[]]<()[]>}]){(<(<>{})([])>{<(){}>{<>()]}){[<[]()><<>()>](([][
+((<{[{{(<<[(<{<>{}}[<>[]]>{<{}<>>{{}[]}})]>><{([<(<>())[{}()]>{<<>{}>{[]{}}}><([[]()]<[]<>>)(<[]>{()()})>)}>)
+{<({{{(<[([<{(<>[])<()[]>}([[]]([]{}))>])[{{[([]){[]{}}]}}{[[{(){}}{<>{}}][[(){}]]]<([<>{}]{{}<>})(
+([([{{{[[<<[[(()[])<<><>>]{({}[])}]((([]{})<<>>)({[]<>}[<>[]]))>{(({<>()})([{}[]]<()<>>)){[
+{[<(({[<<{{{[({}[]){<>()}]{[()()]{[]()}}}[{<<><>>{<>[]}}<{()()}<()>>]}({<(<><>)[()[]]>([{}()])}{[(<>())(()
+<{{[[<{{(<<{<[{}{}]<{}[]>>[{{}[]}[{}()]]}((<()()>{(){}})<((){})>)>[{<({})[[]{}]>([{}<>])}{{[{}()]}{<[
+[{[<{<[[({([(<{}<>>[<>()])]<<<{}{}>({}<>)>>)<{(({}[])({}<>))}<{<[]>({}<>)}{{()()}([]())}>>}){<[<[[{}<>]<
+{(<{{<{<<(<<<[{}{}]((){})>>{<<{}{}>{()[]}>}>)([({(<>())<<>()>>)(<<()[]>(<>())><<()()>({}())>)]{(<[<><
+[{<{[<{([{[({<(){}>([]())}[<<>[]>([]())]){{<(){}>{{}[]}}<[()[]]({})]}](((<{}()>{{}()})))}[[(
+<<[{{[<<(<{({{[]{}}{()()}}){<<{}()>({}<>)>(({}<>)[()<>])}}<[[([]{})[<><>]]]((<()()>{<>[]}){{[]{
+[[({[({[([({{<[]{}>{(){}}}{[[][]][()()]}}[{<{}><{}()>}({()[]})]){{[[()<>]<[][]>][({}<>)]}}](<({<{}(
+[[[((([((<{{[(<>())[{}[]]]{{<>{}}}}}>))<[[[({{{}{}}(()())})({([]{})[<><>]}[([]{}){()[]}])]<{<[{
+[{[<[{{([[{(({()()}<{}[]>){{()<>}{{}()}})<<<{}[]>>{<<>[]><{}{}>}>}]{{{[{()()}[<>()}]{{{}}[(){}]}}}
+[[{[(({[[[[{(<<>()>(<>()))[<{}[]>{[]<>}]}{{{()<>}<()()>}}]<[<([]<>}{<>[]}>]>](((<{()()}<()()>><<<>[]><<>
+({[{({(<{((<<[()[]]<()<>>]<([][])>>[([{}()]<{}{}>){<{}{}>(()[])}])[{([<>()]{()[]}){[()[]]}}([{()<>}
+[(({(([[{(<{{<[][]>(()()}}[({}[])]}[(<<>[]><()[]>)]>)<{({{[]{}}[()[]]}[<<>()>(()())])}{(((()[])<[]>)
+<(<([[({[((((<{}[]>[{}{}]){[{}<>](<><>)})(([()<>]({})){[{}{}]{[]<>}}))[({(()[])<<>[]>}[[()<>]<()
+{[(<<({([{[(<<[][]>(<>())>){<[<>()][[]{}]>(({}[])[(){}])}][(({{}<>}))(<[()()]<()()>>}]}{[{<(<>
+[{{({<({<(<[[<{}<>>{()[]}][{()()}]]>){[<{{()[]}[{}()]}>([<()[]><{}<>>](<()[]>))]{[<[<><>]{<>[]}>[<()
+{[<<[{<<[[(<(<[][]>[()()])>){<(([]()){{}[]})><<[{}()]<<>>>>}}[[([<{}[]><(){}>][({}())[()<>]])[[{<>[]
+{((<[{{<{[<[((()<>)<()()>)]>]}>}((([{[[<<>[]>[[][]]]<[[]()]({}[])]]{[([]{}){()()}]}}<((<[]<
+{[[({<{<<{<{{{[]{}}}}>}[[{(([][]){<>[]}){{()<>}}}<<<()[]>[{}[]]>>]<[{[()[]]({}{})}{[{}()]}]>]>>}>}<
+[{[(<({{(<(([{()<>}{()<>}]{{[]}(()())]))>(<<{[<><>]<()<>>}[(<>{})<<>{}>]>[{{<>{}}{{}[]}}<[<
+{{((<[(([<{{([()][(){}])({<>()}[()<>])}[{[{}<>]<()()>}<{{}}([]<>)>>}(<<[[]{}]<[]<>>>[([]()){[]{}}]>((<<>(
+(<<<(<([<<({<<<><>>[{}<>]>{<()>([]<>)}}{{(<><>)}<{<>()}{{}()}>})<<<({}{})<[]<>>>>>]{({({[][]}[{}()])([<>()](
+([(<<<(<(([([{<>{}}<(){}>](<{}<>>[{}{}]})][([<()>{{}[]}](<<>()><()[]>))[[{<>()}[<>[]]]{<<>[]>
+(<{[[<<<({[<<([]())[()()]>([()[]]{<>{}})>]})[[{<[{<>()}({}{})><(()<>)([]{})>><<<<>()><<>()
+[[[{(<[[((<[{<<>[]>({}[])}<[{}{}]{[]<>}>]<{({}{})}{[{}<>]{<><>}}>>([{[[]<>](()<>)}{{<>{}}(<>[]))]{[{{}{}}]})
+[(<([[[{<[[<((()()){[][]})>((<{}[]>[()<>])<([]()){<>[]}>)]<<{<<><>>}{{(){}}}>>]<{[<<(){}>({}<>)><<<>()>([]<>
+[<((<<[<{[{[{[()[]]{()<>}}(<<>()>[<>()])]}{<[[(){}]{(){}}]{[()]{<>[]}}>{{<[][]>[()()]}[(<>{
+[({{([([{[[([<<>{}>[[]()]]({{}()}))][<{{()[]}}<<{}{}>>><[[{}[]][<>()]][{{}[]}(<>{}))>]][{((((){
+((<<{(([[[{{<[()[]]({}())>}<[{(){}}]<({}{})<()[]>>>}{((<()<>>([]<>)){[()][()[]]})([{()}<[]{}>]<(<><>
+<<<<[([<<(({<[[]()]<<><>>>({[][]})}{([<>{}]<<>()>){{[]{}}}})){[[[[[]{}][(){})]{(()[])(()<>)}]{{[[]<>][{}(
+[({{([<{({{[{(()[])<<><>>}(((){})[<>()])>}{{{{{}<>}<{}[]>}{[(){}](()[])}}}}([(([<>{}](<>[]))
+([(<({{(<<[([[<>][<>()]])<[{()[]}([]{})]{[()<>][[]{}]}>]><<{[{<><>}<()()>]{{<>[]}>}>>><[<{{
+({{(([({{<[<[{{}{}}{{}<>}]((<>{})[[]<>])>(((<><>)<{}()>){{{}{}}{{}{}}})]({<{{}}([][])><<[]{}>
+[(<{({{(<<<(<[{}[]]{(){}}>(([]()){<>[])))[{{[]{}}{()()}}{[<>{}][<>]}]>[((<{}<>>[<>[]])[({}[])<[]{}>])[<[{
+[(<<<[<<({{{[[(){}]]{<<>{}>{()[]}}}{({<>{}}{[][]})}}{<([()[]]<{}<>>)([{}()]({}[]))>[(<<>()>{[]()})]}}{([{{(
+{[{{(({[{<{{[[()<>]<[]<>>]({{}{}}[{}{}])}{(<<>[]>{[]})[[[]{}]{()<>}>}}{<<{{}{}}(()[])>>{{[[]()]
+[<[[{(([<<[<[([][])<[]{}}]{<(){}>}>(<<()<>><[][]>><<{}[]>[{}()]>)]><([([[]<>](()[]))[(()<>)<(){}>]][({
+<{{<([<([{{{(<[]{}>[[]{}])[{<>{}}([])]}}[<[<<><>>({}<>)]{((){})[[]<>]}><[{()[]}<<>{}>]{{()()
+{[<<<([{([{<<(()[]){{}{}}>[(<>{}){{}()}]><[[{}<>][[]()]](<{}()>([]()))>}]){{<{<[()<>][<>()]><
+<{[<<[([[{[({[[]<>](<>[])})({([]<>)<[]()>}<([]<>)[<>[]]>)]}[[{[{()<>}{<>{}}][<[]{}>(<>[])]}<({[]<>
+[[[[([({(((<<[()<>]>[(()())]>{[{{}()}[[]()]]{[<>()]([][])}})))}(<({(({()[]}[<>()]))<[[()<>]]<{{}()}[()<>]
+{[([([<[(<<[<[[]()]<[]<>>>][{<[][]>[<>()]}{({}<>)<()[]>}]><{({<>()}{<><>})<{(){}}({}{})>}<{(
+<<({[<<{(<[<({{}[]}{<>[]})[<()()>]>(([<>()][<><>])(<<>{}><()[]>))](<[<{}<>>[{}[]]]({{}{}}(
+[<<{<(([<[{(([()<>]({}{})){<<>[]>[()()]})({([])(<>())}[{[][]}[{}[]]])}{({(()())[()[]]}({[]<>}([][])))
+((({<[{([(<[(<[]()>)](<[{}()]<[]{}>>(({}())<()[]>))>)[(<[([]<>)(<>{})]>)]][({({[()[]]{<>}}[[[]{}]{()[]}])([<<
+[[[(({[<[((({([]){<>{}}})[[{()[]}[{}[]]][{[]<>}]])<<(<[]{}>[<>[]])[<[][]>[{}[]]]>>)[([{{<><>}[[][]]
+({<(({{[{{<[((<>())(<>[]))<<<><>>((){})>]([<[][]><{}{}>][[{}()]<<>()>])>((<[[]()]([][])>[<{}[]>{
+(({<<([[<[[{<[()()]<[][]}>[{(){}}[{}<>]]}(<{{}<>}{[]<>}>{<(){}>{<><>}})]<<{<<>[]>[<>[]]}{{
+<[{([<[({<((<[{}()]([]<>))[(()[])])((({}{})<()<>>){(()<>)}))>{[<<[<>{}][(){}]>{<<><>>(<>[])}>{[
+{[([[[{{<<[<<<()()>(()<>)>[({}{})[<>{}]]>([[[]<>]]{<<>>[[][]]})]><<[{(()[])][<()>[{}[]]]]<([{}{}][()<>])(
+{(({{<<((<{<<<[]{}>{{}()}><<<>()><()[]>>><<[<>[]]](({}[])[[]{}])>}[[({<>()}{()}){[[]{}]({}())}
+<[[{<[({<([<<<()<>>>>([[[]()]{<><>}](<<>[]>[<>]))])(({({[]{}}){{{}()}{(){}}}}[{(()<>)[[]()]}[{<>()}{[][]}]]))
+{<[[([{<<<{{[<[]{}>[[]<>]]{({}())<[][]>}}<<<{}{}>>({(){}})>}([{({}())}<([]())[()()]>])>({{[[<>()]{{}{
+<{(<[{[[{[<<<{(){}}[<>{}]>{{{}[]}<<>()>}>{[{[]()}<<>>]{<[]{}>[()()]}}>][[[{<<>())[[]<>]}<(<>
+[{{<<{{([(<<{{{}}[()]}<(()())(<>())>>(<{[]()}[[]<>]>)>[((<()()><[]{}>}({[]<>}))(({[][]}{[]<>})<(()[])(()[]
+([(<<[<{({[[[(()<>)<{}()>]{[{}()]{<>{}}}]{(<(){}>{{}[]}){<<><>><{}[]>}}]}<{[[[()()]{{}{}}]]
+{<(((<({<((([<(){}>]){{{<><>}{{}()}}})({<[[]{}]>{({}())}}))>})([[<<<{[{}[]]{[]{}}}<{()<>}({}[])>>>{[
+{([[{[[[<<<({{()<>}}(<[]<>>[<><>]))[[[[]<>][{}()]]]>{<<[<>()][[][]]](<{}{}>{[]{}})>[<(<>{}){<><>}>([{}[]]
+[[{(<{{{<(<{[[{}()](()[])]}<<{(){}}[()[]]>{[()()]([]())}>>)>[(<<<{[][]}>>[{([][])[(){}]}[(<
+<{[(<{<{(<<{<{()[]}(()[])>(([]<>)([]()))}>{((({}[]))<{[]()}{{}()>>)<{<(){}>}<{<>()}<()()>>
+<(<[{{[[{<{[{[<>][<>[]]}]{[(<>[])][<{}{}>{<>}]}}(({[()<>]{[]<>}}<{(){}}[[]{}]>)([[<><>]<()()>]<({}[])([]())
+{(<{[{[{({{(<<<>{}>><({}())(<>())>)}}{(<<<(){}>{(){}}>(<{}()>(<>()))><[{<>()}{{}()}][{[]<>}(()())]>){<[{{}[]
+{[((((({<(([(<[]<>><[]<>>)<<{}()>>](<{()[]}(()<>)>{{{}{}}([]{})})))[<[{([])[<>]}(([]())<{}{}>]]{
+(<{[((([{(<<{(()<>){{}[]}}>><<<({}<>)[[]()]>{(<>[])[()()]}>{{{<><>}([]())}}>)[{(([[]()][<>(
+<[<<<[(<[[(<<([]{})>([[][]][{}{}])><[<<>[]>[{}[]]]<[<>][()()]>>)][[<<{()[]}(<><>)><<()()>[()<>]>>][{[{[]()
+<<{([[<[[<[({[<>[]](()<>)}{({}[]){()[]}}){({{}[]}(<>()))}]<[[<[][]>[[]<>]]<[{}<>]<[]{}>>)>>]<
+[((([[{<<[[<{{{}[]}[()<>]}>(<<{}{}>[(){}]>({<>[]}<{}<>>))][<{[{}<>]{[]}}>({[{}{}}[[][]]})]](({[{[][]}]{[{}
+[([{<[[{<((<<{[]<>}(()<>)>>{(<<>{}>(()<>))}))[(<[[[][]][<>{}]]{[()[]](()())}><({{}{}}}[({}())]>
+{{[({<(({{[({{[]()}<()<>>}{([]()){[]{}}}){[<<>>[<><>]][<{}<>><()[]>]}][{<({}{}><[][]>>{{{}()}<(){}>}}]}}))>}<
+{[{[<{{({[({[[{}()][(){}]]{{[][]}<<>()>}}[[(<>[])<[]{}>]((<>[])[{}()])])]})}}>{({{<([{<([]())[{}{}]>{
+<{{[{<{<<{{({<{}[]>[(){}]}[[<>()]{(){}}])}}[{{[(()<>)(<><>)]<{()<>}{<>()}>}{({[]()}{{}()})<{{
+((((([{{<<[<({()<>}<<>{}))<{{}<>}(<>[])>>{<{(){}}[{}[]]>}]{<<[{}{}]>{{()()}[{}<>]}>}>>([[({(()())<()
+(({{[[<[[<<<<<[]()>[{}<>]]>>({[<<><>><{}()>]{{(){}}[<>{}]}}[[([]<>)({}<>)]])>{<[[<{}[]><{}<>>][<<>[]>]](<<[]
+<[<([<<[([[[[<{}[]><()>][(<>{}){[]}]]{({()[]}[<>{}])}]([((<>[])(<>[]))[{<>[]}{[]<>}]][(([]{})({}<>
+<((<{{({{([<([<>{}](()()))<<(){}>[<>[]>>>({<<>>([]{})})]<[[([]())<<>>]{{<>{}}(()<>)}]>)<[(((<>)<{}<>>)({<>(
+{({<({<<[[{[((<>())<()<>>)<(<>[])((){})>]({{[]()}[{}()]}[[{}{}]<{}[])])}({<[(){}](<><>)><{()<>}[{}[]
+<[(<<[((([(([[[]<>][<><>]]{{{}{}}[{}[]]}){(({}())<[]{}>)})<(<(()[]){()()}>{<()>[[]{}]}){{[[]{}]([]<
+{(<(([{[[<[[[{<>{}}{[]{}}]({(){}})]<[[()()]][[{}[]]]>]{<<{{}{}}[{}{}]>>[(<{}()>([]{}))(<(){}>{<><>}
+((<<({({<{<<[<[]{}><()[]>]<(<>()){()[]}>>>}{(((({}<>)({}()))<{[]{}}<<>[]>>)<({[][]}<(){}>){
+[[<{((({{{(<{[[]{}}{{}}}<{[]{}}<()>>>{<{{}[]}<[]()>>{[()[]]{[][]}}})([{[[][]]}(([]{})<<><>>)][(<[][]>{{}
+(<({[{[(<<(((([]())[<><>]}([<><>]))<[[()<>]<<><>>]{<[]()>{()<>}}>)[<<{[]()}(())>><[<(){}><<>{}
+(<<[<(<{<({<[{(){}}{<><>}][<<>()>]>}<[<[()[]]<{}[]>>]<<({}[]]><[[][]]<[]()>>>>)>}><[((<[<<[]<>>>[[<>()][{}(
+[((<[{[[([{[[<<>>{<>()}]<[[]{}]<[]<>>>]}<({(()<>))<<<>()><<>[]>>)<{<[]{}>((){})}[({}[]){()()}]>
+<<{{({{([{{<<{{}{}}(<>{})><{()()}[{}<>]>><{<[]<>>[[]()]}[<<><>>({})]>}(((<<>{}><{}{}>)([<>{}][{}]))[{
diff --git a/10.jl b/10.jl
new file mode 100644
index 0000000..271332f
--- /dev/null
+++ b/10.jl
@@ -0,0 +1,62 @@
+using Pkg
+Pkg.add("Match")
+using Match
+
+include("utils.jl")
+
+function corrupt(line)
+    first, rest... = line
+    check = [first]
+    for char in rest
+        if char in "<{[("
+            push!(check, char)
+        else
+            match, score = @match char begin
+                '>' => ('<', 25137)
+                '}' => ('{', 1197)
+                ']' => ('[', 57)
+                ')' => ('(', 3)
+            end
+            if last(check) == match
+                pop!(check)
+            else
+                return score
+            end
+        end
+    end
+    0
+end
+
+function solution10_1()
+    sum(map(corrupt, non_empty_lines("10.data")))
+end
+
+function fix(line)
+    first, rest... = line
+    check = [first]
+    for char in rest
+        if char in "<{[("
+            push!(check, char)
+        else
+            pop!(check)
+        end
+    end
+    value = 0
+    for char in reverse(check)
+        value *= 5
+        value += @match char begin
+            '<' => 4
+            '{' => 3
+            '[' => 2
+            '(' => 1
+        end
+    end
+    value
+end
+
+function solution10_2()
+    values = sort(map(fix, filter(line->corrupt(line)==0, collect(non_empty_lines("10.data")))))
+    values[div(length(values), 2)+1]
+end
+
+solution10_2()
diff --git a/10_ex.data b/10_ex.data
new file mode 100644
index 0000000..b1518d9
--- /dev/null
+++ b/10_ex.data
@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]
diff --git a/11.data b/11.data
new file mode 100644
index 0000000..5148c3e
--- /dev/null
+++ b/11.data
@@ -0,0 +1,10 @@
+7777838353
+2217272478
+3355318645
+2242618113
+7182468666
+5441641111
+4773862364
+5717125521
+7542127721
+4576678341
diff --git a/11.jl b/11.jl
new file mode 100644
index 0000000..6e6842e
--- /dev/null
+++ b/11.jl
@@ -0,0 +1,43 @@
+include("utils.jl")
+
+function parse_input(filename)
+    map(x->parse.(Int, x), split.(non_empty_lines(filename), ""))
+end
+
+function flash(octopuses)
+    sum(map(CartesianIndices((2:11, 2:11))) do coord
+        if octopuses[coord] > 9
+            octopuses[coord] = -8
+            for neighbor in CartesianIndices((coord[1]-1:coord[1]+1, coord[2]-1:coord[2]+1))
+                octopuses[neighbor] += 1
+            end
+            1
+        else
+            0
+        end
+    end)
+end
+
+function solution11_1()
+    octopuses = transpose(reshape(reduce(vcat, [[fill(-2000000, 12)]; map(x -> [-2000000; x; -2000000], parse_input("11.data")); [fill(-2000000, 12)]]),(12,12)))
+    sum(map(1:100) do _
+        map!(x->x+1, octopuses, octopuses)
+        flashes = sum(collect(Iterators.takewhile(>(0), (flash(octopuses) for _ in 1:100))))
+        clamp!(octopuses, 0, 9)
+        flashes
+    end)
+end
+
+function solution11_2()
+    octopuses = transpose(reshape(reduce(vcat, [[fill(-2000000, 12)]; map(x -> [-2000000; x; -2000000], parse_input("11_ex.data")); [fill(-2000000, 12)]]),(12,12)))
+    for i in 1:1000
+        map!(x->x+1, octopuses, octopuses)
+        flashes = sum(collect(Iterators.takewhile(>(0), (flash(octopuses) for _ in 1:100))))
+        if flashes == 100
+            return i
+        end
+        clamp!(octopuses, 0, 9)
+    end
+end
+
+solution11_2()
diff --git a/11_ex.data b/11_ex.data
new file mode 100644
index 0000000..03743f6
--- /dev/null
+++ b/11_ex.data
@@ -0,0 +1,10 @@
+5483143223
+2745854711
+5264556173
+6141336146
+6357385478
+4167524645
+2176841721
+6882881134
+4846848554
+5283751526
diff --git a/12.data b/12.data
new file mode 100644
index 0000000..e408c73
--- /dev/null
+++ b/12.data
@@ -0,0 +1,24 @@
+by-TW
+start-TW
+fw-end
+QZ-end
+JH-by
+ka-start
+ka-by
+end-JH
+QZ-cv
+vg-TI
+by-fw
+QZ-by
+JH-ka
+JH-vg
+vg-fw
+TW-cv
+QZ-vg
+ka-TW
+ka-QZ
+JH-fw
+vg-hu
+cv-start
+by-cv
+ka-cv
diff --git a/12.jl b/12.jl
new file mode 100644
index 0000000..50c26c0
--- /dev/null
+++ b/12.jl
@@ -0,0 +1,74 @@
+include("utils.jl")
+
+function solution12_1()
+    lines = non_empty_lines("12.data")
+    adj_mat = Dict()
+    for line in lines
+        front, back = split(line, "-")
+        push!(get!(adj_mat, front, []), back)
+        push!(get!(adj_mat, back, []), front)
+    end
+    result = []
+    growing = [["start"]]
+    while length(growing) > 0
+        new = []
+        for path in growing
+            for neighbour in get(adj_mat, last(path), 0)
+                if Base.Unicode.isuppercase(neighbour[1])
+                    push!(new, [path; neighbour])
+                else
+                    if neighbour == "end"
+                       push!(result, [path; neighbour])
+                    else
+                        if !(neighbour in path)
+                            push!(new, [path; neighbour])
+                        end
+                    end
+                end
+            end
+        end
+        growing = new
+    end
+    length(result)
+end
+
+function small_twice(path)
+    length(filter(unique(path)) do element
+        Base.Unicode.islowercase(element[1]) && length(filter(==(element), path)) > 1
+    end) > 0
+end
+
+
+function solution12_2()
+    lines = non_empty_lines("12.data")
+    adj_mat = Dict()
+    for line in lines
+        front, back = split(line, "-")
+        push!(get!(adj_mat, front, []), back)
+        push!(get!(adj_mat, back, []), front)
+    end
+    result = []
+    growing = [["start"]]
+    while length(growing) > 0
+        new = []
+        for path in growing
+            for neighbour in get(adj_mat, last(path), 0)
+                if Base.Unicode.isuppercase(neighbour[1])
+                    push!(new, [path; neighbour])
+                else
+                    if neighbour == "end"
+                       push!(result, [path; neighbour])
+                    else
+                        if neighbour != "start" &&  (!small_twice(path) || !(neighbour in path))
+                            push!(new, [path; neighbour])
+                        end
+                    end
+                end
+            end
+        end
+        growing = new
+    end
+    length(result)
+end
+
+solution12_2()
diff --git a/12_ex.data b/12_ex.data
new file mode 100644
index 0000000..6fd8c41
--- /dev/null
+++ b/12_ex.data
@@ -0,0 +1,7 @@
+start-A
+start-b
+A-c
+A-b
+b-d
+A-end
+b-end
diff --git a/12_ex_2.data b/12_ex_2.data
new file mode 100644
index 0000000..62cc714
--- /dev/null
+++ b/12_ex_2.data
@@ -0,0 +1,10 @@
+dc-end
+HN-start
+start-kj
+dc-start
+dc-HN
+LN-dc
+HN-end
+kj-sa
+kj-HN
+kj-dc
diff --git a/12_ex_3.data b/12_ex_3.data
new file mode 100644
index 0000000..65f3833
--- /dev/null
+++ b/12_ex_3.data
@@ -0,0 +1,18 @@
+fs-end
+he-DX
+fs-he
+start-DX
+pj-DX
+end-zg
+zg-sl
+zg-pj
+pj-he
+RW-he
+fs-DX
+pj-RW
+zg-RW
+start-pj
+he-WI
+zg-he
+pj-fs
+start-RW
diff --git a/13.data b/13.data
new file mode 100644
index 0000000..4a8c9ec
--- /dev/null
+++ b/13.data
@@ -0,0 +1,972 @@
+587,795
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+55,502
+422,686
+739,110
+17,613
+743,760
+1215,135
+371,280
+858,126
+786,187
+43,166
+887,266
+1021,775
+85,428
+232,686
+1293,281
+258,686
+177,628
+559,196
+1119,371
+485,312
+845,390
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+572,463
+95,628
+197,585
+494,131
+309,613
+405,32
+13,490
+214,605
+1078,271
+1079,255
+817,889
+612,656
+237,406
+1186,428
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+209,330
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+232,875
+1034,71
+83,82
+1203,731
+151,747
+48,551
+17,508
+15,551
+1192,287
+375,345
+900,351
+552,485
+1208,103
+189,281
+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6
diff --git a/13.jl b/13.jl
new file mode 100644
index 0000000..93b19f4
--- /dev/null
+++ b/13.jl
@@ -0,0 +1,36 @@
+include("utils.jl")
+
+function parse_input(filename)
+    lines = collect(non_empty_lines(filename))
+    dots = map(l->parse.(Int, split(l,',')), filter(line->Base.Unicode.isnumeric(line[1]), lines))
+
+    folds = map(filter(line->!Base.Unicode.isnumeric(line[1]), lines)) do line
+        front, coord = split(line, '=')
+        'x' in front ? 1 : 2, parse(Int, coord)
+    end
+    sort(dots), folds
+end
+
+function solution13_2()
+    dots, folds = parse_input("13.data")
+    for (axis, coord) in folds
+        foreach(dots) do dot
+            if dot[axis] > coord
+                dot[axis] -= 2 * (dot[axis] - coord)
+            end
+        end
+        dots = sort(unique(dots))
+    end
+    for y in 0:5
+        for x in 0:38
+            if [x, y] in dots
+                print('#')
+            else
+                print(' ')
+            end
+        end
+        println("")
+    end
+end
+
+solution13_2()
diff --git a/13_ex.data b/13_ex.data
new file mode 100644
index 0000000..282114c
--- /dev/null
+++ b/13_ex.data
@@ -0,0 +1,21 @@
+6,10
+0,14
+9,10
+0,3
+10,4
+4,11
+6,0
+6,12
+4,1
+0,13
+10,12
+3,4
+3,0
+8,4
+1,10
+2,14
+8,10
+9,0
+
+fold along y=7
+fold along x=5
diff --git a/14.data b/14.data
new file mode 100644
index 0000000..5074877
--- /dev/null
+++ b/14.data
@@ -0,0 +1,102 @@
+SCVHKHVSHPVCNBKBPVHV
+
+SB -> B
+HH -> P
+VF -> N
+BS -> S
+NC -> C
+BF -> H
+BN -> H
+SP -> H
+BK -> H
+FF -> N
+VN -> B
+FN -> C
+FS -> S
+PP -> F
+ON -> H
+FV -> F
+KO -> F
+PK -> H
+VB -> S
+HS -> B
+NV -> O
+PN -> S
+VH -> B
+OS -> P
+BP -> H
+OV -> B
+HK -> S
+NN -> K
+SV -> C
+PB -> F
+SK -> F
+FB -> S
+NB -> K
+HF -> P
+FK -> K
+KV -> P
+PV -> F
+BC -> S
+FO -> N
+HC -> F
+CP -> B
+KK -> F
+PC -> S
+HN -> O
+SH -> H
+CK -> P
+CO -> F
+HP -> K
+PS -> C
+KP -> F
+OF -> K
+KS -> F
+NO -> V
+CB -> K
+NF -> N
+SF -> F
+SC -> P
+FC -> V
+BV -> B
+SS -> O
+KC -> K
+FH -> C
+OP -> C
+CF -> K
+VO -> V
+VK -> H
+KH -> O
+NP -> V
+NH -> O
+NS -> V
+BH -> C
+CH -> S
+CC -> F
+CS -> P
+SN -> F
+BO -> S
+NK -> S
+OO -> P
+VV -> F
+FP -> V
+OK -> C
+SO -> H
+KN -> P
+HO -> O
+PO -> H
+VS -> N
+PF -> N
+CV -> F
+BB -> H
+VC -> H
+HV -> B
+CN -> S
+OH -> K
+KF -> K
+HB -> S
+OC -> H
+KB -> P
+OB -> C
+VP -> C
+PH -> K
diff --git a/14.jl b/14.jl
new file mode 100644
index 0000000..421f10a
--- /dev/null
+++ b/14.jl
@@ -0,0 +1,59 @@
+include("utils.jl")
+
+function parse_input(filename)
+    template, rawrules... = collect(non_empty_lines(filename))
+    rules = Dict()
+    for rule in rawrules
+        front, back = split(rule, " -> ")
+        first, second = split(front, "")
+        rules[[first[1], second[1]]] = back[1]
+    end
+    pairs = Dict()
+    for i in 1:length(template)-1
+        get!(pairs, [template[i], template[i+1]], 0)
+        pairs[[template[i], template[i+1]]] += 1
+    end
+    pairs, rules, [first(template), last(template)]
+end
+
+function countpoly(pairs, singles)
+    result = Dict()
+    for (key, value) in pairs
+        get!(result, key[1], 0)
+        result[key[1]] += value
+        get!(result, key[2], 0)
+        result[key[2]] += value
+    end
+    for single in singles
+        result[single] += 1
+    end
+    for key in keys(result)
+        result[key] = div(result[key], 2)
+    end
+    result
+end
+
+function solution14_2()
+    pairs, rules, singles = parse_input("14.data")
+    steps = 40
+    for step in 1:steps
+        new = Dict()
+        for (key, value) in pairs
+            insert = get!(rules, key, nothing)
+            if typeof(insert) == Char
+                get!(new, [key[1], insert], 0)
+                new[[key[1], insert]] += value
+                get!(new, [insert, key[2]], 0)
+                new[[insert, key[2]]] += value
+            else
+                get!(new, key, 0)
+                new[key] += value
+            end
+        end
+        pairs = new
+    end
+    counts = sort(collect(values(countpoly(pairs, singles))))
+    last(counts) - first(counts)
+end
+
+solution14_2()
diff --git a/14_ex.data b/14_ex.data
new file mode 100644
index 0000000..b5594dd
--- /dev/null
+++ b/14_ex.data
@@ -0,0 +1,18 @@
+NNCB
+
+CH -> B
+HH -> N
+CB -> H
+NH -> C
+HB -> C
+HC -> B
+HN -> C
+NN -> C
+BH -> H
+NC -> B
+NB -> B
+BN -> B
+BB -> N
+BC -> B
+CC -> N
+CN -> C
diff --git a/15.data b/15.data
new file mode 100644
index 0000000..94046c7
--- /dev/null
+++ b/15.data
@@ -0,0 +1,100 @@
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diff --git a/15.jl b/15.jl
new file mode 100644
index 0000000..5feee55
--- /dev/null
+++ b/15.jl
@@ -0,0 +1,63 @@
+include("utils.jl")
+
+function parse_input(filename)
+    map(x->parse.(Int, x), split.(non_empty_lines(filename), ""))
+end
+
+function search(entry_risk)
+    width, height = size(entry_risk)
+    total_risk = fill(typemax(Int64), width, height)
+    total_risk[1, 1] = 0
+
+    to_visit = [(CartesianIndex(1,2), 0), (CartesianIndex(2,1), 0)]
+    while length(to_visit) > 0
+        rounds += 1
+        coord, cost = popfirst!(to_visit)
+        cost += entry_risk[coord]
+        if cost < total_risk[coord]
+            total_risk[coord] = cost
+            if coord[1] > 1
+                push!(to_visit, (CartesianIndex(coord[1] - 1, coord[2]), cost))
+            end
+            if coord[1] < width
+                push!(to_visit, (CartesianIndex(coord[1] + 1, coord[2]), cost))
+            end
+            if coord[2] > 1
+                push!(to_visit, (CartesianIndex(coord[1], coord[2] - 1), cost))
+            end
+            if coord[2] < height
+                push!(to_visit, (CartesianIndex(coord[1], coord[2] + 1), cost))
+            end
+        end
+    end
+    total_risk[width, height]
+end
+
+function solution15_1()
+    entry_risk = parse_input("15.data")
+    width = length(entry_risk)
+    height = length(entry_risk[1])
+    entry_risk = transpose(reshape(reduce(vcat, entry_risk), height, width))
+    search(entry_risk)
+end
+
+function solution15_2()
+    entry_risk = parse_input("15.data")
+    width = length(entry_risk)
+    height = length(entry_risk[1])
+    entry_risk = map(entry_risk) do line
+        [line;
+         map(x->mod((x-1)+1, 9)+1, line);
+         map(x->mod((x-1)+2, 9)+1, line);
+         map(x->mod((x-1)+3, 9)+1, line);
+         map(x->mod((x-1)+4, 9)+1, line);
+         ]
+    end
+    for _ in 1:(4*height)
+        push!(entry_risk, map(x->mod((x-1)+1, 9)+1, entry_risk[length(entry_risk) - (height - 1)]))
+    end
+    entry_risk = transpose(reshape(reduce(vcat, entry_risk), height*5, width*5))
+    search(entry_risk)
+end
+
+solution15_2()
diff --git a/15_ex.data b/15_ex.data
new file mode 100644
index 0000000..ab80887
--- /dev/null
+++ b/15_ex.data
@@ -0,0 +1,10 @@
+1163751742
+1381373672
+2136511328
+3694931569
+7463417111
+1319128137
+1359912421
+3125421639
+1293138521
+2311944581
diff --git a/16.data b/16.data
new file mode 100644
index 0000000..cba4dbe
--- /dev/null
+++ b/16.data
@@ -0,0 +1 @@
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
diff --git a/16.jl b/16.jl
new file mode 100644
index 0000000..6e98ecb
--- /dev/null
+++ b/16.jl
@@ -0,0 +1,116 @@
+using Pkg
+Pkg.add("Match")
+using Match
+
+include("utils.jl")
+
+function parse_input(filename)
+    reverse(collect(collect(non_empty_lines(filename))[1]))
+end
+
+mutable struct BinaryReader
+    input
+    rest
+    BinaryReader(input) = new(input, [])
+end
+
+function fill_rest(reader)
+    char = pop!(reader.input)
+    code = codepoint(char)
+    number = code < 0x3A ? code - 0x30 : code - (0x41 - 10)
+    reader.rest = reverse(parse.(Int, collect(string(number, base=2, pad=4))))
+end
+
+function read_bits(reader, count)
+    result = []
+    while length(result) < count
+        if length(reader.rest) == 0
+            fill_rest(reader)
+        end
+        push!(result, pop!(reader.rest))
+    end
+    result
+end
+
+function reader_length(reader)
+    length(reader.rest) + length(reader.input) * 4
+end
+
+function to_int(bits)
+    parse(Int, reduce(*, string.(bits)), base=2)
+end
+
+function parse_literal(reader, version)
+    result = []
+    cont = 1
+    while cont == 1
+        cont = read_bits(reader, 1)[1]
+        result = [result; read_bits(reader, 4)]
+    end
+    (version, 4, to_int(result))
+end
+
+function parse_operator(reader, version, type)
+    length_type = read_bits(reader, 1)[1]
+    subpackets = []
+    if length_type == 0
+        subpacket_bits = to_int(read_bits(reader, 15))
+        start_remaining = reader_length(reader)
+        while reader_length(reader) + subpacket_bits > start_remaining
+            push!(subpackets, parse_packet(reader))
+        end
+    else
+        subpacket_count = to_int(read_bits(reader, 11))
+        for _ in 1:subpacket_count
+            push!(subpackets, parse_packet(reader))
+        end
+    end
+    (version, type, subpackets)
+end
+
+function parse_packet(reader)
+    version = to_int(read_bits(reader, 3))
+    type = to_int(read_bits(reader, 3))
+    if type == 4
+        parse_literal(reader, version)
+    else
+        parse_operator(reader, version, type)
+    end
+end
+
+function sum_versions(packet)
+    result = packet[1]
+    if packet[2] != 4
+        result += reduce(+, sum_versions.(packet[3]))
+    end
+    result
+end
+
+function solution16_1()
+    input = parse_input("16.data")
+    reader = BinaryReader(input)
+    packet = parse_packet(reader)
+    sum_versions(packet)
+end
+
+function value(packet)
+    @match packet[2] begin
+        0 => reduce(+, value.(packet[3]))
+        1 => reduce(*, value.(packet[3]))
+        2 => reduce(min, value.(packet[3]))
+        3 => reduce(max, value.(packet[3]))
+        4 => packet[3]
+        5 => value(packet[3][1]) > value(packet[3][2]) ? 1 : 0
+        6 => value(packet[3][1]) < value(packet[3][2]) ? 1 : 0
+        7 => value(packet[3][1]) == value(packet[3][2]) ? 1 : 0
+    end
+end
+
+function solution16_2()
+    input = parse_input("16.data")
+    reader = BinaryReader(input)
+    packet = parse_packet(reader)
+    value(packet)
+end
+
+solution16_2()
diff --git a/16_ex.data b/16_ex.data
new file mode 100644
index 0000000..3f0eda1
--- /dev/null
+++ b/16_ex.data
@@ -0,0 +1 @@
+D2FE28
diff --git a/16_ex_2.data b/16_ex_2.data
new file mode 100644
index 0000000..a7f8f25
--- /dev/null
+++ b/16_ex_2.data
@@ -0,0 +1 @@
+38006F45291200
diff --git a/16_ex_3.data b/16_ex_3.data
new file mode 100644
index 0000000..f9893b9
--- /dev/null
+++ b/16_ex_3.data
@@ -0,0 +1,16 @@
+9C0141080250320F1802104A08
+9C005AC2F8F0
+F600BC2D8F
+D8005AC2A8F0
+CE00C43D881120
+880086C3E88112
+04005AC33890
+C200B40A82
+
+
+
+A0016C880162017C3686B18A3D4780
+C0015000016115A2E0802F182340
+620080001611562C8802118E34
+8A004A801A8002F478
+EE00D40C823060
diff --git a/17.data b/17.data
new file mode 100644
index 0000000..d6d5bfd
--- /dev/null
+++ b/17.data
@@ -0,0 +1 @@
+target area: x=153..199, y=-114..-75
diff --git a/17.jl b/17.jl
new file mode 100644
index 0000000..a1eb181
--- /dev/null
+++ b/17.jl
@@ -0,0 +1,54 @@
+include("utils.jl")
+
+function parse_input(filename)
+    line = collect(non_empty_lines(filename))[1]
+    println(line)
+    map(x->parse(Int, x.match), eachmatch(r"-?[0-9]+", line))
+end
+
+function inverse_gauss(x)
+    sqrt(1/4 + 2 * x) - 1/2
+end
+
+function valid_x_velocities(left, right)
+    Int64(ceil(inverse_gauss(left))):Int64(floor(inverse_gauss(right)))
+end
+
+function hitp(left, right, bottom, top, vel)
+    pos = [0, 0]
+    mpos = [0, 0]
+    velocity = copy(vel)
+    while pos[2] > bottom
+        pos += velocity
+        mpos = max(pos, mpos)
+        velocity[1] = velocity[1] > 0 ? velocity[1] - 1 : 0
+        velocity[2] -= 1
+
+        if pos[1] >= left && pos[1] <= right && pos[2] >= bottom && pos[2] <= top
+            return true, mpos[2], vel
+        end
+    end
+    false, mpos[2], vel
+end
+
+function solution17_1()
+    left, right, bottom, top = parse_input("17.data")
+    for vx in valid_x_velocities(left, right)
+        shots = map(v->hitp(left, right, bottom, top, v), [[vx, vy] for vy in 1:10000])
+        hits = collect(Iterators.filter(x->x[1], shots))
+        println(last(sort(hits, by=x->x[2])))
+    end
+end
+
+function solution17_2()
+    left, right, bottom, top = parse_input("17.data")
+    sum = 0
+    for vx in 1:right
+        shots = map(v->hitp(left, right, bottom, top, v), [[vx, vy] for vy in bottom:1000])
+        hits = collect(map(x->x[3], Iterators.filter(x->x[1], shots)))
+        sum += length(hits)
+    end
+    sum
+end
+
+solution17_2()
diff --git a/17_ex.data b/17_ex.data
new file mode 100644
index 0000000..a07e02d
--- /dev/null
+++ b/17_ex.data
@@ -0,0 +1 @@
+target area: x=20..30, y=-10..-5
diff --git a/18.data b/18.data
new file mode 100644
index 0000000..0e53f1b
--- /dev/null
+++ b/18.data
@@ -0,0 +1,100 @@
+[[[[8,1],8],[[8,1],0]],[[8,[2,4]],[0,8]]]
+[[[[2,2],[7,4]],[[9,1],6]],8]
+[[[3,6],[[8,7],[2,9]]],[8,[[2,3],9]]]
+[[[[4,5],[1,4]],1],[[0,8],[2,[6,8]]]]
+[[7,[[4,6],[0,0]]],[[4,3],5]]
+[[[[8,4],4],[[4,4],[1,0]]],[[5,[5,5]],[[5,2],1]]]
+[[[0,[5,8]],[1,7]],[[[5,0],[1,3]],7]]
+[4,[[[6,2],[7,8]],[0,[4,4]]]]
+[[[3,[5,3]],8],[[[6,8],4],[8,9]]]
+[[[6,0],[9,[8,1]]],[[[9,7],3],0]]
+[[9,[[9,3],[0,8]]],[[[5,3],0],[[5,6],2]]]
+[[3,[[7,7],3]],[[7,[5,2]],[[6,9],0]]]
+[1,[4,[3,8]]]
+[[[[0,2],9],[[0,7],8]],[[5,4],[2,8]]]
+[[[[1,8],9],[1,7]],[[4,[8,5]],[[6,3],[1,0]]]]
+[[9,[[4,3],[3,3]]],[[[4,9],[0,9]],6]]
+[7,[[8,0],[5,6]]]
+[[[[3,2],1],[[4,9],6]],[[9,[1,1]],[[8,7],1]]]
+[[[[5,1],[3,3]],0],[1,[[3,2],2]]]
+[[7,9],[[9,9],[5,[9,5]]]]
+[[[[4,3],[1,7]],[4,[9,2]]],[[6,[1,7]],[[8,0],3]]]
+[[[5,[2,8]],[[1,2],7]],[[3,[0,5]],[[3,5],8]]]
+[[[[2,2],6],[[2,1],7]],[[[4,6],8],7]]
+[[2,[[3,0],[0,5]]],[[[3,4],[0,1]],0]]
+[[[[9,9],5],[[9,9],6]],[[[4,1],2],0]]
+[4,[[2,9],[6,2]]]
+[[[8,6],6],7]
+[[7,[8,2]],[[[5,5],6],[9,0]]]
+[5,[[2,5],[[4,9],[8,6]]]]
+[[4,[7,[9,6]]],7]
+[[[9,[3,3]],[[3,1],[8,7]]],[[6,[3,5]],[4,1]]]
+[[8,6],[8,[[0,2],[8,1]]]]
+[6,[8,[[7,7],0]]]
+[3,4]
+[[9,[8,0]],[[[7,8],3],1]]
+[5,[[3,[8,7]],[[5,0],[9,7]]]]
+[[[[4,2],9],[6,[0,2]]],6]
+[[4,[3,[4,9]]],[[4,[1,6]],1]]
+[[[6,3],[8,8]],[5,[[9,3],[6,3]]]]
+[[[9,9],[[7,1],6]],[[[1,0],[7,4]],[3,[2,0]]]]
+[[[[2,5],9],[3,[6,2]]],[4,7]]
+[[1,[7,8]],[[[0,1],8],[[1,1],9]]]
+[[[9,[6,4]],[[9,8],[0,2]]],[[[8,9],[2,3]],[3,[8,0]]]]
+[[[[6,8],2],3],[[2,2],5]]
+[[[4,[8,5]],[[4,3],1]],[[[2,4],[4,4]],[[4,1],[1,7]]]]
+[[[[2,6],6],[[9,2],4]],[[[9,9],[9,5]],5]]
+[[[[7,5],[4,9]],4],[[[0,7],[3,6]],[[6,5],[3,0]]]]
+[[[4,4],[[5,7],[8,5]]],[0,8]]
+[[3,[[1,3],[7,5]]],[6,[[8,1],0]]]
+[[[9,9],[5,[9,6]]],[[[4,0],[5,4]],6]]
+[0,[[[9,2],4],3]]
+[[[1,[8,5]],[0,[6,0]]],[[[6,5],[3,1]],[[6,2],[1,5]]]]
+[[[4,0],[4,7]],6]
+[1,[[[5,2],9],[[3,9],4]]]
+[[[[9,6],[4,1]],4],[2,[[0,2],6]]]
+[9,[[[1,5],[3,1]],1]]
+[5,0]
+[9,[[[7,5],[2,1]],[[2,3],[5,3]]]]
+[[5,[[0,5],[9,5]]],[[[2,7],3],[[2,9],[3,5]]]]
+[[[1,9],2],[[7,[1,7]],[8,[9,8]]]]
+[[8,9],[[5,[9,0]],[[6,8],[5,2]]]]
+[6,[[[1,3],[0,8]],4]]
+[[[[9,8],[0,9]],[[8,4],[3,5]]],[[[5,0],8],[[6,8],1]]]
+[[6,[[1,4],[7,0]]],[[3,4],[[2,1],[2,7]]]]
+[[[5,0],[3,[4,7]]],[[9,3],[[9,4],[9,6]]]]
+[[[[8,3],[8,0]],5],[[[5,5],[0,2]],[[0,1],9]]]
+[[[[6,4],[1,8]],[3,[0,2]]],[8,[[8,8],5]]]
+[2,[[2,1],[1,4]]]
+[8,[0,[3,5]]]
+[[[[0,2],3],[[4,9],[1,2]]],[[8,2],[6,[7,1]]]]
+[[[0,0],9],1]
+[8,[[4,1],[[1,3],9]]]
+[[[8,[5,9]],9],[[[5,7],[9,0]],3]]
+[[5,[2,9]],7]
+[5,6]
+[[[[7,5],[8,3]],[[4,3],8]],[[2,2],[[7,2],[4,2]]]]
+[[[9,5],[3,[1,5]]],6]
+[[[[7,4],[7,9]],[[3,1],[3,1]]],[[[6,4],[0,1]],1]]
+[[3,[[7,4],9]],[[[5,8],[2,7]],[[0,4],[3,6]]]]
+[[[3,[2,3]],[[6,0],[7,7]]],1]
+[[2,[[8,8],[2,3]]],[5,2]]
+[[[0,[5,5]],[8,1]],5]
+[[3,9],[6,[[0,5],[1,7]]]]
+[[[[3,0],9],[8,2]],[[[2,2],8],0]]
+[[[9,6],[[5,1],[4,9]]],[[[1,1],[0,3]],[[4,9],[7,5]]]]
+[[[2,[6,1]],[[5,7],[9,2]]],[[[4,2],8],9]]
+[[9,[7,1]],[[4,5],[9,1]]]
+[[9,[5,0]],[[1,7],[[9,6],[4,5]]]]
+[[[[1,1],[8,7]],4],[[0,4],[[1,7],[3,5]]]]
+[[5,[1,[8,4]]],[[[9,4],0],[1,[5,5]]]]
+[[[5,[1,6]],[6,0]],[[0,[9,7]],1]]
+[2,[9,[[0,3],[2,3]]]]
+[3,[4,[[0,9],8]]]
+[[5,6],[[[9,9],[4,0]],[7,[2,0]]]]
+[[[[5,1],6],[[1,0],[7,1]]],[[6,[1,0]],[[4,2],[0,0]]]]
+[[[4,[0,2]],6],[[[4,3],[8,0]],[[9,6],[1,5]]]]
+[[[[5,3],[2,2]],[8,[8,3]]],[[9,1],2]]
+[[3,4],[[[4,7],[2,3]],[9,[9,0]]]]
+[[[5,[6,2]],[[1,5],[9,2]]],[[[7,9],3],[[6,7],[6,2]]]]
+[[[5,3],9],[[2,[4,3]],[[5,3],1]]]
diff --git a/18.jl b/18.jl
new file mode 100644
index 0000000..6748445
--- /dev/null
+++ b/18.jl
@@ -0,0 +1,135 @@
+include("utils.jl")
+
+function parse_value(line, index)
+    if line[index] == '['
+        parse_tuple(line, index)
+    else
+        digits = match(r"^[0-9]+", SubString(line, index)).match
+        index += length(digits)
+        parse(Int, digits), index
+    end
+end
+
+function parse_tuple(line, index=1)
+    @assert line[index] == '['
+    index += 1
+
+    first, index = parse_value(line, index)
+
+    @assert line[index] == ','
+    index += 1
+
+    second, index = parse_value(line, index)
+
+    @assert line[index] == ']'
+    index +=1
+
+    return Any[first, second], index
+end
+
+function parse_input(filename)
+    map(x->x[1], map(parse_tuple, non_empty_lines(filename)))
+end
+
+function split_sf(a)
+    if typeof(a) == Int64
+        if a > 9
+            Any[div(a,2),div(a,2)+rem(a,2)], true
+        else
+            a, false
+        end
+    else
+        l, changed = split_sf(a[1])
+        a[1] = l
+        if changed
+            a, true
+        else
+            r, changed = split_sf(a[2])
+            a[2] = r
+            a, changed
+        end
+    end
+end
+
+function add_left_sf(a, number)
+    if typeof(a) == Int64
+        a + number
+    else
+        a[1] = add_left_sf(a[1], number)
+        a
+    end
+end
+
+function add_right_sf(a, number)
+    if typeof(a) == Int64
+        a + number
+    else
+        a[2] = add_right_sf(a[2], number)
+        a
+    end
+end
+
+function explode_sf(a, level=1)
+    if typeof(a) == Int64
+        return a, false, 0, 0
+    end
+    if level == 5
+        @assert typeof(a[1]) == Int64 && typeof(a[2]) == Int64
+        0, true, a[1], a[2]
+    else
+        l, changed, to_left, to_right = explode_sf(a[1], level + 1)
+        if changed
+            Any[l, add_left_sf(a[2], to_right)], true, to_left, 0
+        else
+            r, changed, to_left, to_right = explode_sf(a[2], level + 1)
+            if changed
+                Any[add_right_sf(l, to_left), r], true, 0, to_right
+            else
+                a, false, 0, 0
+            end
+        end
+    end
+end
+
+function reduce_sf(a)
+    changed = true
+    while changed
+        a, changed = explode_sf(a)
+        if changed
+            continue
+        end
+        a, changed = split_sf(a)
+    end
+    a
+end
+
+function add_sf(a, b)
+    reduce_sf(Any[deepcopy(a), deepcopy(b)])
+end
+
+function mag_sf(a)
+    if typeof(a) == Int64
+        a
+    else
+        3 * mag_sf(a[1]) + 2 * mag_sf(a[2])
+    end
+end
+
+function solution18_1()
+    mag_sf(reduce(add_sf, parse_input("18.data")))
+end
+
+function solution18_2()
+    input = collect(parse_input("18.data"))
+    max_mag = 0
+    for a in input
+        for b in input
+            print('.')
+            max_mag = max(max_mag, mag_sf(add_sf(a, b)))
+        end
+    end
+    println("")
+    max_mag
+end
+
+solution18_2()
diff --git a/18_ex.data b/18_ex.data
new file mode 100644
index 0000000..1368dc4
--- /dev/null
+++ b/18_ex.data
@@ -0,0 +1,10 @@
+[[[0,[5,8]],[[1,7],[9,6]]],[[4,[1,2]],[[1,4],2]]]
+[[[5,[2,8]],4],[5,[[9,9],0]]]
+[6,[[[6,2],[5,6]],[[7,6],[4,7]]]]
+[[[6,[0,7]],[0,9]],[4,[9,[9,0]]]]
+[[[7,[6,4]],[3,[1,3]]],[[[5,5],1],9]]
+[[6,[[7,3],[3,2]]],[[[3,8],[5,7]],4]]
+[[[[5,4],[7,7]],8],[[8,3],8]]
+[[9,3],[[9,9],[6,[4,9]]]]
+[[2,[[7,7],7]],[[5,8],[[9,3],[0,2]]]]
+[[[[5,2],5],[8,[3,7]]],[[5,[7,5]],[4,4]]]
diff --git a/19.data b/19.data
new file mode 100644
index 0000000..6a45b66
--- /dev/null
+++ b/19.data
@@ -0,0 +1,1023 @@
+--- scanner 0 ---
+-535,-526,-765
+627,-311,420
+-587,-471,242
+581,-596,-710
+-602,794,452
+-716,825,-607
+487,760,-636
+-620,-456,271
+-37,-16,-1
+-647,-543,-606
+608,-713,-821
+-657,903,537
+-667,-557,-727
+670,-310,354
+-672,-675,243
+536,888,514
+549,-605,-861
+644,831,538
+599,-378,391
+-641,962,-643
+133,68,-113
+516,800,-553
+582,762,538
+-710,842,-633
+568,907,-594
+-549,867,508
+
+--- scanner 1 ---
+456,-531,375
+-576,842,-474
+610,385,-866
+-834,-556,-713
+-643,671,-468
+-762,-584,448
+682,-362,-794
+-514,568,445
+646,585,578
+-886,-519,461
+459,-646,390
+-719,819,-521
+517,-589,317
+499,-382,-859
+-760,-651,-763
+-103,-42,-119
+660,530,565
+461,449,-781
+-524,564,727
+446,497,576
+-800,-587,481
+456,358,-860
+-18,68,-9
+609,-398,-871
+-796,-580,-574
+-490,612,654
+
+--- scanner 2 ---
+472,403,682
+241,-583,724
+-675,357,-564
+-669,378,521
+-613,451,574
+-608,-750,432
+676,-520,-952
+-699,483,-610
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+-436,-449,-565
+433,338,-596
+-699,414,-672
+300,-486,706
+-621,-681,516
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+-14,-81,-129
+
+--- scanner 3 ---
+-657,-678,460
+509,-860,-656
+-401,-632,-610
+-549,-710,546
+767,-464,771
+379,775,-813
+387,525,-780
+730,-541,714
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+-417,648,492
+377,-823,-696
+507,642,-807
+-313,727,-816
+787,-458,664
+-313,582,508
+
+--- scanner 4 ---
+-975,452,-498
+317,632,-820
+-738,-476,296
+-939,-527,-429
+458,519,739
+774,-515,-893
+817,-715,-874
+476,-731,558
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+649,-645,-891
+-93,-61,-123
+-717,694,445
+421,-840,473
+442,716,-804
+247,701,-785
+-734,-466,578
+
+--- scanner 5 ---
+127,-40,150
+-499,-631,677
+40,38,-15
+760,726,921
+-502,593,-452
+-386,-724,-812
+-270,-650,-808
+-522,-542,641
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+-320,-660,-679
+551,721,-473
+849,-608,823
+597,-415,-726
+-629,444,411
+
+--- scanner 6 ---
+-448,-863,770
+507,-372,-525
+679,509,-466
+658,447,-589
+832,-741,685
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+-710,-496,-403
+-452,538,-624
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+-522,862,841
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+-849,-493,-544
+826,-721,792
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+531,666,400
+
+--- scanner 7 ---
+-736,638,-635
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+-565,-925,650
+572,740,-916
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+-719,679,-456
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+-705,-617,-569
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+-179,-24,-80
+-870,-714,-576
+
+--- scanner 8 ---
+620,-611,-583
+-57,-86,-120
+-826,-510,-686
+-776,-492,-631
+713,447,404
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+-544,426,566
+-433,238,-835
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+-411,284,-621
+-584,489,641
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+-705,-569,-775
+353,409,-409
+
+--- scanner 9 ---
+547,349,-654
+824,-472,701
+-644,-834,480
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+-657,-723,492
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+-757,-828,553
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+-650,528,-619
+-383,-609,-510
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+
+--- scanner 10 ---
+-740,-619,-757
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+-125,59,140
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+-465,625,-703
+-628,644,-782
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+-757,-562,529
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+-888,-543,-704
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+-631,498,517
+-867,-568,638
+
+--- scanner 11 ---
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+-250,-778,413
+-277,-898,530
+-617,-592,-566
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+-244,-906,280
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+-486,459,559
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+-562,-579,-580
+-820,364,-822
+-644,378,-875
+561,-901,-536
+
+--- scanner 12 ---
+-617,543,-421
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+-411,-724,-749
+369,-370,450
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+300,-845,-649
+-693,-720,-759
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+-484,-676,-783
+641,437,510
+778,788,-710
+
+--- scanner 13 ---
+344,570,524
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+-49,81,-108
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+-591,726,633
+-457,-579,572
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+-332,-642,591
+-823,-498,-749
+-780,813,-693
+
+--- scanner 14 ---
+554,-398,907
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+-333,-662,-757
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+-700,-536,623
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+-466,311,914
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+-748,-528,776
+
+--- scanner 15 ---
+-106,-70,-82
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+-657,-414,-441
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+-574,361,570
+-519,-489,467
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+375,-437,610
+418,810,-826
+
+--- scanner 16 ---
+-692,744,489
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+-593,301,-664
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+-558,663,467
+-554,-778,-811
+-624,-567,756
+-439,-590,780
+425,-687,585
+-506,-576,593
+
+--- scanner 17 ---
+808,370,854
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+-650,-572,-403
+579,220,-540
+710,421,840
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+-657,720,493
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+-576,-562,-484
+-609,619,-279
+-327,-648,502
+-346,-708,355
+752,-620,-283
+508,-756,512
+-483,657,-281
+
+--- scanner 18 ---
+734,-473,878
+729,-454,797
+-606,900,-657
+-505,595,644
+-942,-410,443
+-880,-351,500
+623,393,637
+-953,-376,316
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+-45,-25,-101
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+-551,933,-481
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+665,877,-400
+661,647,-389
+-544,-354,-629
+-425,-351,-584
+520,-235,-898
+-586,448,686
+-155,166,46
+
+--- scanner 19 ---
+846,-264,-485
+739,-282,-343
+-538,-550,380
+-811,408,-463
+673,-492,417
+709,-424,414
+-60,18,59
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+-618,-400,414
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+-542,-518,-570
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+778,-404,-408
+510,478,721
+-728,-531,397
+-848,495,339
+654,538,-352
+-599,-432,-672
+507,577,839
+
+--- scanner 20 ---
+-558,-529,-663
+-613,-622,-537
+-646,-486,588
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+-718,889,703
+-77,128,142
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+69,47,57
+-746,-373,605
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+458,-473,570
+-667,608,-396
+618,-406,641
+703,829,-715
+860,959,920
+-756,863,540
+-659,-382,592
+
+--- scanner 21 ---
+387,619,594
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+-642,-643,460
+-687,-637,496
+-746,-450,-504
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+-669,713,484
+-813,716,484
+-784,-537,413
+-167,47,127
+641,-705,-502
+-744,789,-370
+653,-891,462
+
+--- scanner 22 ---
+499,-702,-536
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+-255,-512,865
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+116,-180,41
+-380,-392,882
+-672,-785,-539
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+-484,-484,843
+-733,-628,-494
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+-791,-749,-519
+-466,600,560
+-631,697,-549
+-426,602,514
+503,-575,770
+
+--- scanner 23 ---
+284,396,482
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+259,-796,-632
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+-64,-180,-124
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+-851,-486,456
+-904,-634,532
+324,388,567
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+592,-626,406
+-742,434,228
+382,-617,475
+-850,-909,-712
+-924,341,-541
+
+--- scanner 24 ---
+-718,-571,-517
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+-763,-696,548
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+-805,519,-708
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+-70,-16,-109
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+337,536,-590
+-774,647,383
+-748,-690,536
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+772,-445,-881
+-858,-732,520
+
+--- scanner 25 ---
+861,766,536
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+-521,-827,-460
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+626,332,-409
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+-618,523,506
+-567,512,691
+624,377,-382
+623,561,-469
+-594,345,-473
+
+--- scanner 26 ---
+-814,603,-395
+392,-526,908
+554,471,-570
+469,363,917
+479,-608,-454
+-756,-741,596
+-681,-640,477
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+-78,-73,73
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+-595,-473,-418
+571,630,-458
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+-797,629,-389
+-630,755,604
+429,-647,882
+-934,593,-464
+
+--- scanner 27 ---
+562,-872,-449
+-705,-666,-777
+-544,475,-752
+455,323,-568
+-667,-400,561
+-613,485,-872
+-719,607,616
+-99,-152,23
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+514,-799,-415
+-597,-695,-813
+-10,11,-72
+284,329,-501
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+-634,-429,546
+307,376,-644
+
+--- scanner 28 ---
+813,-729,560
+-696,-708,-638
+-757,-610,-517
+-828,599,563
+-659,781,-782
+591,865,-339
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+-755,541,506
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+-52,47,13
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+647,880,-339
+-696,796,-805
+-770,538,621
+590,686,497
+-664,-718,565
+413,589,508
+365,742,500
+
+--- scanner 29 ---
+-826,-688,686
+661,-934,-381
+-838,-820,763
+462,-511,665
+714,-516,659
+845,426,-759
+-617,311,-610
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+-49,9,15
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+-686,-939,-554
+-676,-823,-673
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+-593,391,-722
+730,-762,-385
+
+--- scanner 30 ---
+544,-423,-876
+-959,884,454
+17,108,-84
+-491,-610,-356
+471,-348,621
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+-934,735,-411
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+-920,703,-403
+-121,-6,7
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+-390,-527,-404
+-411,-659,-370
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+536,-472,634
+-612,-710,355
+
+--- scanner 31 ---
+-447,-404,-548
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+492,-479,-265
+559,367,-664
+538,-793,480
+-816,263,-631
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+-770,295,-525
+-569,-473,-591
+376,-643,-255
+403,-534,-228
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+476,382,883
+-572,-813,835
+
+--- scanner 32 ---
+-334,-684,-605
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+-330,522,-519
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+-388,583,-461
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+-272,-717,940
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+-578,379,600
+410,-408,834
+-360,-847,-643
+-589,593,567
+-392,-600,967
+-591,393,655
+781,357,-292
+
+--- scanner 33 ---
+-538,-478,-649
+-558,678,-597
+864,-661,842
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+-506,-530,-729
+692,-634,-698
+-456,-600,488
+-340,759,966
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+-622,578,-624
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+-312,737,737
+869,-655,590
+560,-557,-710
+-648,689,-616
+-435,-440,-781
+-577,-625,430
+-613,-645,549
+772,454,755
+636,323,-375
+705,478,-371
+705,379,-257
+697,-482,-785
+-220,776,841
+
+--- scanner 34 ---
+-319,-366,692
+-673,-708,-703
+-462,-377,679
+816,-624,-462
+-382,408,518
+398,-442,790
+-819,667,-544
+111,179,111
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+-790,807,-670
+949,-670,-361
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+-420,406,644
+-669,-727,-773
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+935,733,-741
+-480,-348,694
+-423,545,503
+-768,648,-633
+-618,-713,-675
+928,867,-850
+
+--- scanner 35 ---
+-515,-659,738
+366,-600,566
+-614,410,609
+-712,799,-745
+-483,427,719
+-654,840,-659
+-722,673,-635
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+-544,-501,-393
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+325,-450,526
+449,-707,-788
+-557,-437,-313
+25,-95,180
+692,713,-356
+490,-722,-651
+-1,86,40
+
+--- scanner 36 ---
+620,426,-526
+777,-583,514
+901,-648,527
+-13,59,-94
+118,-48,53
+-484,-785,-793
+-699,790,515
+606,613,-593
+811,-587,-508
+-444,-521,456
+-594,-769,-805
+-630,794,343
+-684,767,552
+-667,-805,-728
+-441,-636,441
+815,-580,547
+849,-611,-647
+-633,739,-645
+597,450,-711
+-502,-578,383
+805,623,515
+775,-516,-697
+-714,717,-779
+-767,719,-717
+707,502,454
+717,621,338
diff --git a/19.jl b/19.jl
new file mode 100644
index 0000000..a9119eb
--- /dev/null
+++ b/19.jl
@@ -0,0 +1,140 @@
+include("utils.jl")
+
+function parse_input(filename)
+    scanners = []
+    current = []
+    for line in non_empty_lines(filename)
+        if line[1] == '-' && line[2] == '-'
+            push!(scanners, current)
+            current = []
+        else
+            coord = collect(map(m->parse(Int, m.match), eachmatch(r"-?[0-9]+", line)))
+            push!(current, coord)
+        end
+    end
+    push!(scanners, current)
+    scanners[2:length(scanners)]
+end
+
+transforms = [
+    # up: z
+    a -> a,
+    a -> [-a[2], a[1], a[3]],
+    a -> [-a[1], -a[2], a[3]],
+    a -> [a[2], -a[1], a[3]],
+    # up: -z
+    a -> [-a[1], a[2], -a[3]],
+    a -> [a[2], a[1], -a[3]],
+    a -> [a[1], -a[2], -a[3]],
+    a -> [-a[2], -a[1], -a[3]],
+    # up: x
+    a -> [-a[3], a[2], a[1]],
+    a -> [a[2], a[3], a[1]],
+    a -> [a[3], -a[2], a[1]],
+    a -> [-a[2], -a[3], a[1]],
+    # up: -x
+    a -> [a[3], a[2], -a[1]],
+    a -> [-a[2], a[3], -a[1]],
+    a -> [-a[3], -a[2], -a[1]],
+    a -> [a[2], -a[3], -a[1]],
+    # up: y
+    a -> [a[1], -a[3], a[2]],
+    a -> [-a[3], -a[1], a[2]],
+    a -> [-a[1], a[3], a[2]],
+    a -> [a[3], a[1], a[2]],
+    # up: -y
+    a -> [a[1], a[3], -a[2]],
+    a -> [-a[3], a[1], -a[2]],
+    a -> [-a[1], -a[3], -a[2]],
+    a -> [a[3], -a[1], -a[2]],
+]
+
+function try_match(a, b)
+    for c in a
+        for d in b
+            t = c - d
+            if length(intersect(a, map(x->x+t, b))) > 11
+                println("pos $t")
+                #println(intersect(a, map(x->x+t, b)))
+                return true, collect(map(x->x+t, b))
+            end
+        end
+    end
+    false, nothing
+end
+
+function find_match(fixed, scanners)
+    for (f,j) in fixed
+        for i in 1:length(scanners)
+            s,k = scanners[i]
+            for t in transforms
+                td = collect(map(t, s))
+                matchp, transformed = try_match(f, td)
+                if matchp
+                    println("f: $(j-1) s: $(k-1) ✓")
+                    return i, transformed
+                end
+            end
+#            println("f: $(j-1) s: $(k-1) x")
+        end
+    end
+end
+
+function solution19_1()
+    scanners = collect(parse_input("19.data"))
+    zipped = collect(zip(scanners, 1:length(scanners)))
+    fixed = [popfirst!(zipped)]
+    while length(zipped) > 0
+        index, transformed = find_match(fixed, zipped)
+        s = popat!(zipped, index)
+#        println(s[1])
+#        println(transformed)
+        push!(fixed, (transformed, s[2]))
+        l = length(fixed)
+        println("located $l")
+    end
+    length(reduce(union, map(x->x[1], fixed)))
+end
+
+function solution19_2()
+    positions = [[0, 0, 0],
+                 [-28, 1245, -161],
+                 [1163, 26, -170],
+                 [-1254, 90, -158],
+                 [-18, 1355, -1280],
+                 [1146, -1193, -28],
+                 [-2380, 15, -13],
+                 [-1078, 63, 1010],
+                 [-1105, 28, -1236],
+                 [-12, 2400, -1318],
+                 [-1075, 1190, -1385],
+                 [-2348, 173, -1313],
+                 [-2450, -1024, -26],
+                 [-3547, 0, -79],
+                 [-1233, -1211, 1144],
+                 [-1092, 1288, 1125],
+                 [-2449, 1277, -1238],
+                 [-2290, -2266, -141],
+                 [-4753, 30, -166],
+                 [-3532, 97, 1132],
+                 [-1224, 2573, 1061],
+                 [-2428, 1249, 1069],
+                 [-2269, -3556, -95],
+                 [-1131, -2278, -172],
+                 [-2337, -2411, 1197],
+                 [-4722, 31, 1198],
+                 [-6042, 159, -182],
+                 [-3560, 131, 2245],
+                 [-2385, -3457, 1117],
+                 [-2369, -4811, -22],
+                 [-1144, -3615, -89],
+                 [-4732, -17, 2315],
+                 [-5936, -1062, -10],
+                 [-2339, -3488, 2394],
+                 [-2334, -4684, 1017],
+                 [-3472, -3589, 2361],
+                 [-1256, -3495, 2220]]
+    reduce(max, map(a->sum(abs.(a)), map(a->a[1]-a[2], [(a,b) for a in positions for b in positions])))
+end
+
+solution19_2()
diff --git a/19_ex.data b/19_ex.data
new file mode 100644
index 0000000..4e496e9
--- /dev/null
+++ b/19_ex.data
@@ -0,0 +1,136 @@
+--- scanner 0 ---
+404,-588,-901
+528,-643,409
+-838,591,734
+390,-675,-793
+-537,-823,-458
+-485,-357,347
+-345,-311,381
+-661,-816,-575
+-876,649,763
+-618,-824,-621
+553,345,-567
+474,580,667
+-447,-329,318
+-584,868,-557
+544,-627,-890
+564,392,-477
+455,729,728
+-892,524,684
+-689,845,-530
+423,-701,434
+7,-33,-71
+630,319,-379
+443,580,662
+-789,900,-551
+459,-707,401
+
+--- scanner 1 ---
+686,422,578
+605,423,415
+515,917,-361
+-336,658,858
+95,138,22
+-476,619,847
+-340,-569,-846
+567,-361,727
+-460,603,-452
+669,-402,600
+729,430,532
+-500,-761,534
+-322,571,750
+-466,-666,-811
+-429,-592,574
+-355,545,-477
+703,-491,-529
+-328,-685,520
+413,935,-424
+-391,539,-444
+586,-435,557
+-364,-763,-893
+807,-499,-711
+755,-354,-619
+553,889,-390
+
+--- scanner 2 ---
+649,640,665
+682,-795,504
+-784,533,-524
+-644,584,-595
+-588,-843,648
+-30,6,44
+-674,560,763
+500,723,-460
+609,671,-379
+-555,-800,653
+-675,-892,-343
+697,-426,-610
+578,704,681
+493,664,-388
+-671,-858,530
+-667,343,800
+571,-461,-707
+-138,-166,112
+-889,563,-600
+646,-828,498
+640,759,510
+-630,509,768
+-681,-892,-333
+673,-379,-804
+-742,-814,-386
+577,-820,562
+
+--- scanner 3 ---
+-589,542,597
+605,-692,669
+-500,565,-823
+-660,373,557
+-458,-679,-417
+-488,449,543
+-626,468,-788
+338,-750,-386
+528,-832,-391
+562,-778,733
+-938,-730,414
+543,643,-506
+-524,371,-870
+407,773,750
+-104,29,83
+378,-903,-323
+-778,-728,485
+426,699,580
+-438,-605,-362
+-469,-447,-387
+509,732,623
+647,635,-688
+-868,-804,481
+614,-800,639
+595,780,-596
+
+--- scanner 4 ---
+727,592,562
+-293,-554,779
+441,611,-461
+-714,465,-776
+-743,427,-804
+-660,-479,-426
+832,-632,460
+927,-485,-438
+408,393,-506
+466,436,-512
+110,16,151
+-258,-428,682
+-393,719,612
+-211,-452,876
+808,-476,-593
+-575,615,604
+-485,667,467
+-680,325,-822
+-627,-443,-432
+872,-547,-609
+833,512,582
+807,604,487
+839,-516,451
+891,-625,532
+-652,-548,-490
+30,-46,-14
diff --git a/19_ex_2.data b/19_ex_2.data
new file mode 100644
index 0000000..6835346
--- /dev/null
+++ b/19_ex_2.data
@@ -0,0 +1,39 @@
+--- scanner 0 ---
+-1,-1,1
+-2,-2,2
+-3,-3,3
+-2,-3,1
+5,6,-4
+8,0,7
+
+--- scanner 0 ---
+1,-1,1
+2,-2,2
+3,-3,3
+2,-1,3
+-5,4,-6
+-8,-7,0
+
+--- scanner 0 ---
+-1,-1,-1
+-2,-2,-2
+-3,-3,-3
+-1,-3,-2
+4,6,5
+-7,0,8
+
+--- scanner 0 ---
+1,1,-1
+2,2,-2
+3,3,-3
+1,3,-2
+-4,-6,5
+7,0,8
+
+--- scanner 0 ---
+1,1,1
+2,2,2
+3,3,3
+3,1,2
+-6,-4,-5
+0,7,-8
diff --git a/1_ex.data b/1_ex.data
new file mode 100644
index 0000000..167e291
--- /dev/null
+++ b/1_ex.data
@@ -0,0 +1,10 @@
+199
+200
+208
+210
+200
+207
+240
+269
+260
+263
diff --git a/2.data b/2.data
new file mode 100644
index 0000000..720a7fd
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+++ b/2.data
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+up 4
+forward 4
+forward 5
+down 5
+down 8
+up 7
+down 2
+down 6
+forward 5
diff --git a/2.jl b/2.jl
new file mode 100644
index 0000000..fa18b84
--- /dev/null
+++ b/2.jl
@@ -0,0 +1,51 @@
+using Pkg
+Pkg.add("Match")
+using Match
+
+include("utils.jl")
+
+function solution2_1()
+    input_lines = non_empty_lines("2.data")
+
+    function parse_line(line)
+        (command, amount) = split(line, " ")
+        parsed_amount = parse(Int, amount)
+    end
+
+    map(fline->split(line, " "), input_lines)
+
+    x = 0
+    y = 0
+
+    for line in input_lines
+        (command, amount) = split(line, " ")
+        parsed_amount = parse(Int, amount)
+        @match command begin
+            "forward" => begin x += parsed_amount end
+            "up" => begin y -= parsed_amount end
+            "down" => begin y += parsed_amount end
+        end
+    end
+    (x, y, x*y)
+end
+
+function solution2_2()
+    input_lines = non_empty_lines("2.data")
+
+    aim = 0
+    x = 0
+    y = 0
+
+    for line in input_lines
+        (command, amount) = split(line, " ")
+        parsed_amount = parse(Int, amount)
+        @match command begin
+            "forward" => begin x += parsed_amount; y += parsed_amount * aim end
+            "up" => begin aim -= parsed_amount end
+            "down" => begin aim += parsed_amount end
+        end
+    end
+    (x, y, x*y)
+end
+
+(solution2_1(), solution2_2())
diff --git a/20.data b/20.data
new file mode 100644
index 0000000..05ddd45
--- /dev/null
+++ b/20.data
@@ -0,0 +1,102 @@
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diff --git a/20.jl b/20.jl
new file mode 100644
index 0000000..1660db8
--- /dev/null
+++ b/20.jl
@@ -0,0 +1,58 @@
+include("utils.jl")
+
+function convert_to_binary(string)
+    map(x->x=='#' ? 1 : 0, collect(string))
+end
+
+function parse_input(filename, iterations)
+    lines = collect(non_empty_lines(filename))
+    algorithm = convert_to_binary(lines[1])
+
+    dim = length(lines[2])
+    buffered_dim = 2 * iterations + dim
+
+    fix_lines = fill(fill(0, buffered_dim), iterations)
+
+    i = [fix_lines;
+         map(convert_to_binary, map(x-> reduce(*, fill(".", iterations)) * x * reduce(*, fill(".", iterations)), lines[2:length(lines)]));
+         fix_lines]
+    image = transpose(reshape(reduce(vcat, i), buffered_dim, buffered_dim))
+    algorithm, image
+end
+
+function getv(algorithm, image, i, x, y)
+    address = []
+    for ox in (x-1):(x+1)
+        for oy in (y-1):(y+1)
+            if ox < 1 || ox > size(image)[1] || oy < 1 || oy > size(image)[1]
+                # example
+#                push!(address, "0")
+                # real
+                push!(address, i % 2 == 1 ? "0" : "1")
+            else
+                push!(address, string(image[ox,oy]))
+            end
+        end
+    end
+    algorithm[parse(Int, reduce(*, address), base=2)+1]
+end
+
+function enhance(fname, iterations)
+    algorithm, image = parse_input(fname, iterations)
+    for i in 1:iterations
+        new = copy(image)
+        for x in 1:size(image)[1]
+            for y in 1:size(image)[1]
+                new[x, y] = getv(algorithm, image, i, x, y)
+            end
+        end
+        image = new
+    end
+    length(filter(==(1), image))
+end
+
+function solution20_1()
+    enhance("20.data", 50)
+end
+
+solution20_1()
diff --git a/20_ex.data b/20_ex.data
new file mode 100644
index 0000000..8fa4bd4
--- /dev/null
+++ b/20_ex.data
@@ -0,0 +1,7 @@
+..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#
+
+#..#.
+#....
+##..#
+..#..
+..###
diff --git a/21.jl b/21.jl
new file mode 100644
index 0000000..a7895a1
--- /dev/null
+++ b/21.jl
@@ -0,0 +1,70 @@
+function make_dice(max_value)
+    next = max_value - 1
+    r = 0
+    function roll()
+        r += 1
+        next += 1
+        next %= max_value
+        return next + 1
+    end
+    function rolls()
+        r
+    end
+    roll, rolls
+end
+
+function advance(pos, dice)
+    pos += dice()+dice()+dice()
+    ((pos - 1) % 10) + 1
+end
+
+function solution21_1()
+    pos_a = 8
+    pos_b = 5
+    dice, times = make_dice(100)
+    score_a = 0
+    score_b = 0
+    while true
+        pos_a = advance(pos_a, dice)
+        score_a += pos_a
+        println("a -> $pos_a ($score_a)")
+        if score_a >= 1000
+            r = times()
+            println("$score_b $r $(score_b * r)")
+            break
+        end
+        pos_b = advance(pos_b, dice)
+        score_b += pos_b
+        println("b -> $pos_b ($score_b)")
+        if score_b >= 1000
+            r = times()
+            println("$score_a $r $(score_a * r)")
+            break
+        end
+    end
+end
+
+using Pkg
+Pkg.add("Memoize")
+using Memoize
+
+DICE = [(a,b,c) for a in 1:3 for b in 1:3 for c in 1:3]
+
+@memoize function round(pa, pb, sa, sb)
+    sum(map(DICE) do dice
+            npa = pa + sum(dice)
+            npa = ((npa - 1) % 10) + 1
+            nsa = sa + npa
+            if nsa >= 21
+                [1, 0]
+            else
+                circshift(round(pb, npa, sb, nsa), 1)
+            end
+        end)
+end
+
+function solution21_2()
+    round(8, 5, 0, 0)
+end
+
+solution21_2()
diff --git a/22.data b/22.data
new file mode 100644
index 0000000..db381dd
--- /dev/null
+++ b/22.data
@@ -0,0 +1,420 @@
+on x=-9..45,y=-15..37,z=-2..46
+on x=-48..2,y=-11..37,z=3..48
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+on x=-14064..20202,y=-90417..-70077,z=25371..40391
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diff --git a/22.jl b/22.jl
new file mode 100644
index 0000000..ca6e88d
--- /dev/null
+++ b/22.jl
@@ -0,0 +1,106 @@
+include("utils.jl")
+
+function interval(coords)
+    coords[1]:coords[2]
+end
+
+function parse_input(filename)
+    map(non_empty_lines(filename)) do line
+        command, coords = split(line)
+        coords = map(x->parse(Int, x.match), eachmatch(r"-?[0-9]+", coords))
+        coords = [interval(sort(coords[1:2])),
+                  interval(sort(coords[3:4])),
+                  interval(sort(coords[5:6]))]
+        command, coords
+    end
+end
+
+function ccontains(a, b)
+    all(issubset.(a, b))
+end
+
+function cempty(cube)
+    reduce(min, length.(cube)) == 0
+end
+
+function setdiffcubes(cube, subcube)
+    above = [cube[1],                              cube[2],                              (subcube[3].stop+1):(cube[3].stop)]
+    below = [cube[1],                              cube[2],                              (cube[3].start):(subcube[3].start-1)]
+    far =   [cube[1],                              (subcube[2].stop+1):(cube[2].stop),   subcube[3]]
+    near =  [cube[1],                              (cube[2].start):(subcube[2].start-1), subcube[3]]
+    right = [(subcube[1].stop+1):(cube[1].stop),   subcube[2],                           subcube[3]]
+    left =  [(cube[1].start):(subcube[1].start-1), subcube[2],                           subcube[3]]
+
+    filter(c->!cempty(c), [above, below, far, near, right, left])
+end
+
+function add_cube(cubes, cube)
+    if length(cubes) == 0
+        return [cube]
+    end
+
+    if any(map(c->ccontains(cube, c), cubes))
+        return cubes
+    end
+    cubes = filter(c->!ccontains(c, cube), cubes)
+
+    result = [cube]
+    for c in cubes
+        inter = intersect.(c, cube)
+        if cempty(inter)
+            push!(result, c)
+        else
+            append!(result, setdiffcubes(c, inter))
+        end
+    end
+    result
+end
+
+function remove_cube(cubes, cube)
+    if length(cubes) == 0
+        return []
+    end
+    result = []
+    for c in cubes
+        if ccontains(c, cube)
+            continue
+        end
+        inter = intersect.(c, cube)
+        if cempty(inter)
+            push!(result, c)
+            continue
+        end
+        append!(result, setdiffcubes(c, inter))
+    end
+    result
+end
+
+function magnitude(cube)
+    reduce(*, length.(cube))
+end
+
+function run(filter=nothing)
+    cubes = []
+    for (command, coords) in parse_input("22.data")
+        if typeof(filter) == Int64 && reduce(max, map(x->reduce(max, abs.(x)), coords)) > filter
+            continue
+        end
+        if command == "on"
+            cubes = add_cube(cubes, coords)
+        else
+            cubes = remove_cube(cubes, coords)
+        end
+    end
+    sum(map(magnitude, cubes))
+end
+
+
+function solution22_1()
+    run(50)
+end
+
+function solution22_2()
+    run()
+end
+
+solution22_1(), solution22_2()
diff --git a/22_ex.data b/22_ex.data
new file mode 100644
index 0000000..25975df
--- /dev/null
+++ b/22_ex.data
@@ -0,0 +1,4 @@
+on x=10..12,y=10..12,z=10..12
+on x=11..13,y=11..13,z=11..13
+off x=9..11,y=9..11,z=9..11
+on x=10..10,y=10..10,z=10..10
diff --git a/22_ex_2.data b/22_ex_2.data
new file mode 100644
index 0000000..e665295
--- /dev/null
+++ b/22_ex_2.data
@@ -0,0 +1,22 @@
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+off x=-48..-32,y=26..41,z=-47..-37
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+off x=-40..-22,y=-38..-28,z=23..41
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diff --git a/22_ex_3.data b/22_ex_3.data
new file mode 100644
index 0000000..aba7585
--- /dev/null
+++ b/22_ex_3.data
@@ -0,0 +1,60 @@
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diff --git a/2_ex.data b/2_ex.data
new file mode 100644
index 0000000..b7172ac
--- /dev/null
+++ b/2_ex.data
@@ -0,0 +1,6 @@
+forward 5
+down 5
+forward 8
+up 3
+down 8
+forward 2
diff --git a/3.data b/3.data
new file mode 100644
index 0000000..ac22a69
--- /dev/null
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diff --git a/3.jl b/3.jl
new file mode 100644
index 0000000..7cdf2a7
--- /dev/null
+++ b/3.jl
@@ -0,0 +1,61 @@
+include("utils.jl")
+
+function parse_input(filename)
+    input_lines = collect(non_empty_lines(filename))
+    width = length(input_lines[1])
+    integers = map(x->parse(Int, x, base = 2), input_lines)
+    (integers, width)
+end
+
+function most_common_bit(integers, width)
+    score = zeros(Int, width)
+    for int in integers
+        for index in 1:width
+            score[index] += ((int >> (index-1) & 1) - 0.5) * 2
+        end
+    end
+    map(map(sign, score)) do x
+        if x == 0
+            1
+        else
+            x
+        end
+    end
+end
+
+function solution3_1()
+    integers, width = parse_input("3.data")
+
+    score = most_common_bit(integers, width)
+
+    result = 0
+    cresult = 0
+    for i in 1:width
+        result += ((score[i] + 1) >> 1) << (i - 1)
+        cresult += (((score[i] * -1) + 1) >> 1) << (i - 1)
+    end
+    (result, cresult, result * cresult)
+end
+
+function filterdata(integers, width, score_factor)
+    ints = copy(integers)
+    for i in reverse(1:width)
+        score = most_common_bit(ints, width) * score_factor
+        ints = filter(ints) do x
+            (x & (1 << (i - 1))) >> (i - 1) == (score[i] + 1) >> 1
+        end
+        if length(ints) == 1
+            break
+        end
+    end
+    ints[1]
+end
+
+function solution3_2()
+    integers, width = parse_input("3.data")
+    oxy = filterdata(integers, width, 1)
+    co2 = filterdata(integers, width, -1)
+    (oxy, co2, oxy * co2)
+end
+
+solution3_2()
diff --git a/3_ex.data b/3_ex.data
new file mode 100644
index 0000000..a6366a8
--- /dev/null
+++ b/3_ex.data
@@ -0,0 +1,12 @@
+00100
+11110
+10110
+10111
+10101
+01111
+00111
+11100
+10000
+11001
+00010
+01010
diff --git a/4.data b/4.data
new file mode 100644
index 0000000..6f02da3
--- /dev/null
+++ b/4.data
@@ -0,0 +1,601 @@
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diff --git a/4.jl b/4.jl
new file mode 100644
index 0000000..e74a733
--- /dev/null
+++ b/4.jl
@@ -0,0 +1,83 @@
+include("utils.jl")
+
+function parse_boards(lines)
+    num_boards = div(length(lines),5)
+    boards = Array{Array{Int}}(undef, num_boards)
+    for i in 1:num_boards
+        boards[i] = zeros(5, 5)
+        for li in 1:5
+            values = map(x->parse(Int, x), split(lines[(i - 1)*5+li]))
+            boards[i][li,:] .= values
+        end
+    end
+    boards
+end
+
+function parse_input(filename)
+    lines = Iterators.Stateful(non_empty_lines(filename))
+    numbers = map(x->parse(Int, x), split(popfirst!(lines), ","))
+    boards = parse_boards(collect(lines))
+    numbers, boards
+end
+
+function apply(number, boards)
+    for board in boards
+        for i in CartesianIndices((1:5, 1:5))
+            if board[i] == number
+                board[i] = -1
+            end
+        end
+    end
+end
+
+function check(boards)
+    for board in boards
+        for i in 1:5
+            if (reduce(+, board[i,:]) == -5) || (reduce(+, board[:,i]) == -5)
+                return true, board
+            end
+        end
+    end
+    false, nothing
+end
+
+function solution4_1()
+    numbers, boards = parse_input("4.data")
+    for number in numbers
+        apply(number, boards)
+        winning, board = check(boards)
+        if winning
+            score = reduce(+, filter(>(0), board))
+            return (score, number, score * number)
+        end
+    end
+end
+
+function remove_winning_boards(boards)
+    last = nothing
+    filtered = filter(boards) do board
+        for i in 1:5
+            if (reduce(+, board[i,:]) == -5) || (reduce(+, board[:,i]) == -5)
+                last = board
+                return false
+            end
+        end
+        true
+    end
+    filtered, last
+end
+
+
+function solution4_2()
+    numbers, boards = parse_input("4.data")
+    for number in numbers
+        apply(number, boards)
+        boards, board = remove_winning_boards(boards)
+        if length(boards) == 0
+            score = reduce(+, filter(>(0), board))
+            return (score, number, score * number)
+        end
+    end
+end
+
+solution4_2()
diff --git a/4_ex.data b/4_ex.data
new file mode 100644
index 0000000..669a51d
--- /dev/null
+++ b/4_ex.data
@@ -0,0 +1,19 @@
+7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
+22 13 17 11  0
+ 8  2 23  4 24
+21  9 14 16  7
+ 6 10  3 18  5
+ 1 12 20 15 19
+
+ 3 15  0  2 22
+ 9 18 13 17  5
+19  8  7 25 23
+20 11 10 24  4
+14 21 16 12  6
+
+14 21 17 24  4
+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7
diff --git a/5.data b/5.data
new file mode 100644
index 0000000..abe5fe3
--- /dev/null
+++ b/5.data
@@ -0,0 +1,500 @@
+427,523 -> 427,790
+94,639 -> 94,951
+757,371 -> 465,663
+503,935 -> 503,148
+655,565 -> 655,951
+167,754 -> 710,211
+634,433 -> 245,433
+449,889 -> 449,509
+152,753 -> 207,808
+301,90 -> 301,982
+566,405 -> 482,405
+758,741 -> 847,652
+342,686 -> 921,107
+741,317 -> 741,533
+976,917 -> 976,664
+273,272 -> 273,899
+326,616 -> 326,478
+483,906 -> 391,814
+20,165 -> 20,349
+860,533 -> 860,137
+846,834 -> 846,610
+155,923 -> 241,923
+989,984 -> 17,12
+711,681 -> 82,52
+312,788 -> 312,281
+319,746 -> 892,746
+568,555 -> 757,555
+659,450 -> 940,450
+870,260 -> 870,487
+110,794 -> 604,794
+509,141 -> 509,99
+29,68 -> 29,713
+340,688 -> 820,688
+428,46 -> 902,520
+539,525 -> 539,210
+181,822 -> 806,822
+551,338 -> 551,79
+894,542 -> 894,151
+700,625 -> 700,60
+143,736 -> 143,770
+810,975 -> 54,219
+44,373 -> 44,514
+849,794 -> 120,794
+347,690 -> 97,440
+10,625 -> 57,625
+541,202 -> 799,202
+375,491 -> 809,925
+271,474 -> 271,905
+980,825 -> 980,908
+600,751 -> 624,751
+120,978 -> 958,140
+262,916 -> 262,794
+399,350 -> 399,666
+623,270 -> 158,735
+585,792 -> 585,381
+168,34 -> 168,88
+256,806 -> 566,806
+196,397 -> 326,397
+583,677 -> 172,677
+45,242 -> 311,508
+530,469 -> 433,566
+46,101 -> 877,932
+607,655 -> 485,777
+773,672 -> 461,360
+340,30 -> 659,30
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+457,700 -> 125,368
+571,656 -> 561,656
+251,30 -> 576,30
+79,197 -> 79,87
+518,51 -> 518,904
+916,802 -> 181,67
+23,626 -> 485,626
+956,106 -> 956,811
+849,384 -> 743,278
+893,153 -> 893,608
+17,989 -> 933,73
+701,119 -> 701,704
+494,580 -> 494,821
+605,740 -> 605,363
+823,58 -> 823,166
+250,363 -> 566,363
+418,178 -> 783,178
+273,82 -> 273,115
+545,489 -> 656,489
+468,671 -> 966,671
+376,744 -> 178,942
+62,728 -> 589,201
+588,150 -> 467,29
+202,664 -> 751,115
+519,547 -> 916,150
+803,483 -> 380,60
+599,459 -> 922,459
+162,680 -> 162,385
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+802,734 -> 415,347
+115,964 -> 115,935
+749,595 -> 749,770
+229,64 -> 582,64
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+137,581 -> 707,11
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+59,222 -> 620,222
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+666,331 -> 413,78
+517,650 -> 425,558
+803,256 -> 803,598
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+124,975 -> 967,132
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+239,140 -> 239,211
+975,779 -> 364,168
+971,49 -> 531,49
+408,932 -> 143,932
+927,663 -> 392,128
+497,246 -> 497,389
+849,935 -> 15,101
+582,517 -> 543,517
+410,85 -> 237,85
+292,316 -> 841,316
+753,708 -> 753,38
+266,328 -> 267,327
+789,980 -> 16,207
+514,963 -> 514,180
+865,532 -> 687,710
+544,620 -> 956,208
+132,287 -> 557,287
+268,710 -> 268,684
+234,746 -> 234,688
+51,906 -> 51,911
+191,159 -> 428,159
+834,956 -> 834,565
+916,242 -> 230,928
+227,789 -> 227,689
+206,767 -> 705,268
+291,403 -> 578,403
+35,890 -> 956,890
+185,618 -> 402,401
+989,858 -> 284,858
+391,284 -> 391,74
+717,158 -> 670,111
+188,146 -> 785,743
+602,696 -> 602,367
+975,972 -> 975,317
+146,301 -> 146,205
+328,215 -> 861,215
+15,653 -> 990,653
+48,101 -> 48,34
+929,547 -> 506,970
+901,519 -> 670,519
+801,560 -> 19,560
+953,829 -> 876,829
+856,317 -> 856,787
+618,171 -> 86,703
+823,622 -> 369,168
+209,291 -> 846,928
+944,601 -> 944,544
+678,223 -> 987,223
+893,143 -> 54,982
+30,740 -> 244,740
+974,974 -> 15,15
+497,557 -> 63,557
+846,193 -> 846,964
+83,119 -> 946,982
+864,179 -> 864,387
+583,312 -> 77,818
+612,154 -> 612,641
+487,136 -> 487,938
+502,611 -> 215,898
+648,978 -> 648,885
+373,372 -> 318,372
+582,988 -> 168,574
+453,261 -> 899,261
+467,578 -> 33,578
+876,138 -> 683,331
+708,248 -> 132,824
+686,56 -> 686,211
+687,964 -> 687,485
+626,76 -> 626,222
+630,176 -> 630,485
+968,608 -> 968,382
+943,69 -> 943,856
+173,344 -> 173,902
+193,918 -> 326,918
+811,748 -> 379,316
+484,941 -> 113,570
+277,635 -> 156,514
+770,573 -> 691,573
+37,475 -> 464,475
+720,856 -> 676,856
+988,13 -> 25,976
+414,74 -> 140,74
+169,158 -> 29,298
+611,910 -> 611,718
+851,161 -> 507,161
+76,969 -> 76,114
+270,243 -> 976,949
+375,607 -> 325,657
+738,450 -> 196,450
+153,776 -> 153,325
+862,123 -> 862,535
+705,933 -> 931,933
+900,26 -> 35,891
+870,66 -> 79,857
+815,569 -> 347,569
+950,290 -> 757,290
+719,446 -> 317,848
+243,531 -> 671,531
+320,807 -> 380,807
+221,984 -> 221,858
+832,308 -> 832,950
+522,694 -> 584,694
+412,48 -> 412,328
+898,690 -> 646,690
+602,191 -> 106,191
+58,961 -> 58,879
+177,413 -> 147,383
+48,159 -> 48,639
+18,935 -> 883,70
+26,68 -> 406,68
+579,73 -> 579,523
+975,825 -> 975,737
+390,125 -> 737,472
+127,179 -> 127,111
+506,557 -> 576,487
+161,210 -> 324,47
+524,165 -> 524,67
+938,790 -> 184,36
+302,431 -> 548,677
+559,363 -> 559,913
+936,10 -> 176,770
+828,976 -> 657,976
+864,14 -> 864,607
+28,46 -> 28,347
+732,742 -> 732,615
+91,712 -> 91,279
+982,884 -> 772,674
+917,47 -> 683,47
+631,697 -> 83,697
+463,413 -> 463,949
+719,348 -> 197,870
+980,25 -> 24,981
+64,608 -> 410,954
+103,882 -> 103,842
+279,10 -> 830,561
+409,573 -> 409,247
+673,291 -> 222,291
+315,143 -> 942,770
+216,89 -> 80,225
+134,936 -> 967,103
+387,566 -> 82,566
+282,259 -> 862,839
+930,225 -> 930,775
+460,370 -> 460,922
+276,254 -> 518,496
+647,881 -> 293,527
+983,977 -> 90,84
+336,836 -> 336,392
+96,888 -> 963,21
+42,47 -> 978,983
+923,280 -> 726,83
+311,486 -> 505,292
+496,637 -> 861,637
+575,438 -> 575,498
+228,754 -> 228,599
+965,963 -> 21,19
+834,171 -> 730,171
+497,234 -> 497,448
+977,970 -> 977,618
+335,422 -> 335,640
+931,954 -> 36,59
+140,966 -> 871,235
+352,88 -> 449,88
+631,332 -> 735,332
+765,823 -> 48,106
+496,685 -> 103,685
+89,416 -> 89,37
+121,544 -> 569,544
+643,712 -> 596,712
+662,656 -> 739,656
+42,386 -> 42,697
+959,875 -> 959,527
+874,967 -> 120,213
+962,649 -> 240,649
+627,714 -> 266,714
+148,301 -> 148,383
+883,491 -> 883,605
+242,401 -> 348,401
+660,931 -> 420,931
+475,72 -> 955,552
+912,949 -> 912,881
+928,330 -> 45,330
+474,203 -> 131,203
+805,459 -> 818,459
+534,645 -> 639,750
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+717,276 -> 21,972
+233,615 -> 957,615
+902,495 -> 902,867
+230,427 -> 230,421
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+884,903 -> 34,53
+157,205 -> 157,409
+857,588 -> 608,588
+422,863 -> 422,469
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+691,881 -> 52,242
+171,435 -> 209,435
+978,15 -> 702,15
+581,86 -> 581,282
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+176,351 -> 707,882
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+700,373 -> 700,650
+40,40 -> 945,945
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+351,402 -> 455,402
+517,242 -> 73,686
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+543,734 -> 611,734
+688,849 -> 688,571
+631,903 -> 883,903
+312,636 -> 667,281
+213,575 -> 699,89
+752,128 -> 161,719
+754,931 -> 754,474
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+123,667 -> 57,667
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+58,162 -> 632,736
+417,164 -> 166,164
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+355,756 -> 355,167
+340,546 -> 232,438
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+915,160 -> 56,160
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+940,73 -> 940,784
+922,581 -> 922,753
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+591,778 -> 145,778
+93,685 -> 164,756
+287,469 -> 287,948
+953,952 -> 446,445
+935,47 -> 12,970
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+71,643 -> 644,70
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+666,429 -> 666,920
+962,246 -> 517,246
+400,261 -> 400,713
+601,617 -> 943,275
+904,847 -> 120,63
+556,334 -> 278,612
+416,463 -> 59,463
+724,401 -> 871,548
+701,210 -> 426,485
+786,116 -> 786,904
+976,979 -> 157,160
+674,377 -> 674,891
+321,829 -> 891,829
+404,84 -> 404,800
+975,850 -> 906,781
+753,331 -> 978,331
+87,240 -> 87,383
+167,390 -> 167,20
+258,931 -> 107,780
+672,313 -> 696,313
+589,88 -> 589,13
+637,65 -> 637,808
+532,610 -> 532,756
+612,482 -> 318,482
+522,322 -> 135,322
+89,49 -> 89,679
+475,506 -> 475,973
+385,348 -> 229,348
+633,978 -> 633,255
+978,833 -> 978,436
+746,553 -> 707,553
+970,820 -> 970,548
+589,59 -> 589,19
+674,890 -> 16,890
+838,315 -> 413,740
+39,129 -> 860,950
+923,755 -> 425,257
+757,929 -> 940,746
+639,390 -> 104,925
+650,512 -> 260,902
+718,90 -> 987,90
+352,228 -> 795,671
+141,629 -> 491,279
+755,616 -> 368,616
+117,113 -> 707,703
+206,73 -> 926,793
+372,415 -> 372,130
+894,632 -> 611,632
+974,554 -> 878,554
+823,710 -> 823,972
+730,711 -> 582,859
+94,912 -> 108,912
+782,190 -> 88,884
+668,567 -> 336,567
+87,266 -> 327,506
+738,303 -> 36,303
+320,358 -> 445,358
+566,725 -> 695,725
+94,364 -> 94,64
+884,184 -> 159,909
+947,575 -> 947,662
+658,741 -> 658,470
+512,776 -> 512,960
+96,757 -> 950,757
+349,604 -> 349,760
+459,247 -> 355,143
+90,12 -> 95,12
+28,27 -> 981,980
+388,959 -> 508,959
+704,194 -> 148,194
+349,546 -> 349,259
+30,38 -> 720,728
+307,631 -> 307,282
+520,417 -> 154,417
+746,771 -> 924,771
+838,932 -> 20,114
+406,141 -> 406,75
+15,35 -> 963,983
+264,143 -> 948,827
+545,899 -> 742,899
+759,356 -> 309,356
+686,707 -> 224,245
+226,985 -> 962,249
+826,628 -> 826,637
+985,329 -> 683,631
+586,283 -> 586,258
+602,703 -> 243,703
+419,883 -> 419,556
+475,375 -> 211,111
+981,15 -> 19,977
+989,10 -> 10,989
+238,350 -> 479,591
+720,714 -> 603,714
+969,985 -> 35,51
+844,356 -> 837,349
+450,354 -> 450,834
+385,870 -> 385,758
+911,856 -> 89,34
+948,124 -> 989,124
+439,556 -> 439,310
+990,233 -> 990,633
+747,723 -> 943,527
+418,23 -> 804,23
+876,96 -> 38,934
+556,92 -> 532,92
+727,155 -> 727,279
+674,545 -> 940,811
+118,879 -> 420,879
+141,50 -> 426,335
+591,180 -> 591,537
+662,511 -> 681,511
+776,858 -> 776,956
+872,329 -> 87,329
+183,985 -> 114,985
+186,179 -> 186,801
+354,933 -> 491,933
+10,223 -> 759,972
+112,626 -> 702,36
+498,78 -> 161,78
+196,61 -> 814,679
+629,71 -> 116,71
+23,281 -> 23,32
+819,810 -> 432,423
+187,276 -> 187,912
+95,683 -> 576,683
+125,813 -> 856,82
+98,882 -> 140,882
+843,909 -> 198,909
+192,904 -> 192,335
+375,342 -> 375,668
+61,804 -> 61,832
+475,387 -> 966,878
+822,740 -> 822,186
diff --git a/5.jl b/5.jl
new file mode 100644
index 0000000..9df8ac6
--- /dev/null
+++ b/5.jl
@@ -0,0 +1,67 @@
+include("utils.jl")
+
+function parse_input(filename)
+    map(non_empty_lines(filename)) do line
+        collect(map(x->parse(Int, x.match), eachmatch(r"[0-9]+", line)))
+    end
+end
+
+function solution5_1()
+    max_x = 0
+    max_y = 0
+    lines = filter(parse_input("5.data")) do line
+        max_x = max(max_x, line[1], line[2])
+        max_y = max(max_y, line[2], line[4])
+        line[1] == line[3] || line[2] == line[4]
+    end
+    board = fill(0, max_x + 1 , max_y + 1)
+    for line in lines
+        if line[1] == line[3]
+            if line[2] <= line[4]
+                for i in line[2]:line[4]
+                    board[line[1] + 1, i + 1] += 1
+                end
+            else
+                for i in line[4]:line[2]
+                    board[line[1] + 1, i + 1] += 1
+                end
+            end
+        else
+            if line[1] <= line[3]
+                for i in line[1]:line[3]
+                    board[i + 1, line[2] + 1] += 1
+                end
+            else
+                for i in line[3]:line[1]
+                    board[i + 1, line[2] + 1] += 1
+                end
+            end
+        end
+    end
+    length(filter(>(1), board))
+end
+
+function solution5_2()
+    max_x = 0
+    max_y = 0
+    lines = filter(parse_input("5.data")) do line
+        max_x = max(max_x, line[1], line[2])
+        max_y = max(max_y, line[2], line[4])
+        true
+    end
+    board = fill(0, max_x + 1 , max_y + 1)
+    for line in lines
+        x = line[1]
+        y = line[2]
+        board[x + 1, y + 1] += 1
+        while x != line[3] || y != line[4]
+            x += sign(line[3]-line[1])
+            y += sign(line[4]-line[2])
+            board[x + 1, y + 1] += 1
+        end
+    end
+    length(filter(>(1), board))
+    #    transpose(board)
+end
+
+solution5_2()
diff --git a/5_ex.data b/5_ex.data
new file mode 100644
index 0000000..b258f68
--- /dev/null
+++ b/5_ex.data
@@ -0,0 +1,10 @@
+0,9 -> 5,9
+8,0 -> 0,8
+9,4 -> 3,4
+2,2 -> 2,1
+7,0 -> 7,4
+6,4 -> 2,0
+0,9 -> 2,9
+3,4 -> 1,4
+0,0 -> 8,8
+5,5 -> 8,2
diff --git a/6.data b/6.data
new file mode 100644
index 0000000..afcd5e5
--- /dev/null
+++ b/6.data
@@ -0,0 +1 @@
+2,1,1,4,4,1,3,4,2,4,2,1,1,4,3,5,1,1,5,1,1,5,4,5,4,1,5,1,3,1,4,2,3,2,1,2,5,5,2,3,1,2,3,3,1,4,3,1,1,1,1,5,2,1,1,1,5,3,3,2,1,4,1,1,1,3,1,1,5,5,1,4,4,4,4,5,1,5,1,1,5,5,2,2,5,4,1,5,4,1,4,1,1,1,1,5,3,2,4,1,1,1,4,4,1,2,1,1,5,2,1,1,1,4,4,4,4,3,3,1,1,5,1,5,2,1,4,1,2,4,4,4,4,2,2,2,4,4,4,2,1,5,5,2,1,1,1,4,4,1,4,2,3,3,3,3,3,5,4,1,5,1,4,5,5,1,1,1,4,1,2,4,4,1,2,3,3,3,3,5,1,4,2,5,5,2,1,1,1,1,3,3,1,1,2,3,2,5,4,2,1,1,2,2,2,1,3,1,5,4,1,1,5,3,3,2,2,3,1,1,1,1,2,4,2,2,5,1,2,4,2,1,1,3,2,5,5,3,1,3,3,1,4,1,1,5,5,1,5,4,1,1,1,1,2,3,3,1,2,3,1,5,1,3,1,1,3,1,1,1,1,1,1,5,1,1,5,5,2,1,1,5,2,4,5,5,1,1,5,1,5,5,1,1,3,3,1,1,3,1
diff --git a/6.jl b/6.jl
new file mode 100644
index 0000000..1b2d34b
--- /dev/null
+++ b/6.jl
@@ -0,0 +1,19 @@
+function solution6(n)
+    initial = parse.(Int, split(readline("6.data"),","))
+    fish = [count(initial .== i) for i in 0:8]
+    for _ in 1:n
+        fish = circshift(fish, -1)
+        fish[7] += fish[9]
+    end
+    sum(fish)
+end
+
+function solution6_1()
+    solution6(80)
+end
+
+function solution6_2()
+    solution6(256)
+end
+
+solution6_1(),solution6_2()
diff --git a/6_ex.data b/6_ex.data
new file mode 100644
index 0000000..55129f1
--- /dev/null
+++ b/6_ex.data
@@ -0,0 +1 @@
+3,4,3,1,2
diff --git a/7.data b/7.data
new file mode 100644
index 0000000..4407d6f
--- /dev/null
+++ b/7.data
@@ -0,0 +1 @@
+1101,1,29,67,1102,0,1,65,1008,65,35,66,1005,66,28,1,67,65,20,4,0,1001,65,1,65,1106,0,8,99,35,67,101,99,105,32,110,39,101,115,116,32,112,97,115,32,117,110,101,32,105,110,116,99,111,100,101,32,112,114,111,103,114,97,109,10,478,1187,253,1892,900,155,20,787,17,248,1397,407,167,686,638,1020,960,124,840,220,1824,700,373,4,551,229,294,567,254,350,1144,679,124,361,145,483,335,202,1334,367,60,870,11,557,482,645,672,1296,1538,427,78,542,1135,13,65,0,140,705,13,642,187,1085,36,1118,349,601,382,584,941,26,949,200,763,198,430,204,1352,1135,210,342,11,1089,830,1523,9,523,167,762,254,805,8,132,29,102,1299,936,756,59,134,183,235,316,139,48,182,44,88,213,113,93,169,565,601,1899,1191,189,796,770,32,1183,365,374,867,918,1084,86,75,20,47,99,1140,2,99,1024,366,455,752,556,1220,66,326,450,213,1,342,756,49,675,160,280,68,221,193,379,88,179,94,16,109,570,1145,1207,824,355,1389,1601,168,86,236,923,120,759,14,478,460,84,167,1723,1005,269,6,171,861,311,832,952,701,3,1598,1466,96,780,57,161,631,572,276,105,594,276,17,405,688,1444,173,23,199,177,689,19,565,472,151,986,76,379,1430,212,928,106,25,143,84,833,942,860,1555,271,239,720,596,1209,235,535,361,1794,79,283,275,17,342,1687,1434,173,967,740,217,1370,18,1579,1259,546,94,623,475,834,1000,456,101,520,120,1023,360,167,213,617,42,1149,629,760,17,33,27,1347,414,646,1116,1340,134,259,143,407,249,328,968,677,241,438,98,313,27,791,1,634,3,918,1482,213,123,444,45,24,26,26,1203,64,67,1562,1,4,298,12,384,32,443,37,268,674,356,202,286,694,272,163,950,1022,54,59,21,73,519,462,106,76,1112,10,72,388,194,6,120,9,645,209,1121,75,599,362,661,439,69,62,339,390,23,1247,365,1266,4,246,511,47,467,134,276,497,130,458,427,669,1191,701,917,168,1191,294,641,236,801,375,106,872,800,87,356,583,1096,253,459,951,1331,719,66,1091,525,15,370,290,141,1201,30,43,37,76,1131,616,297,172,402,1016,654,301,63,872,303,69,1195,502,351,52,1659,86,104,294,807,166,120,190,333,60,283,819,198,184,144,278,343,1395,496,103,705,485,172,642,225,181,583,188,38,436,801,91,5,634,180,28,20,146,488,676,121,420,965,220,1564,1011,241,423,3,1631,709,106,725,164,1032,65,205,503,188,397,1072,49,121,761,721,249,418,87,126,258,712,500,435,157,127,681,108,270,647,504,505,83,407,212,165,1177,160,715,1292,491,195,141,25,829,1316,242,754,364,1707,33,594,434,488,368,298,183,1156,29,1674,537,378,8,9,860,240,571,749,471,331,501,156,62,427,1103,52,12,832,1198,284,388,827,556,194,288,218,397,84,1485,95,401,739,986,994,305,668,1324,1437,312,993,15,822,923,707,135,42,423,37,1183,1344,997,19,699,395,119,7,168,1711,50,151,38,20,163,686,1364,21,24,411,32,335,188,55,628,274,1766,439,180,286,1024,87,15,1498,290,561,971,32,294,67,113,219,42,18,715,3,664,242,583,221,1045,236,74,46,1612,639,325,164,100,69,518,38,502,26,329,112,1174,127,124,90,144,527,468,152,1098,800,125,349,191,290,191,27,651,446,267,9,1304,269,586,64,983,152,236,512,8,248,177,109,311,957,47,126,69,13,709,204,381,1151,580,340,994,865,258,190,9,1149,930,1128,321,100,471,0,507,1308,326,585,813,1088,76,174,333,387,631,186,430,988,24,820,11,45,173,167,1494,98,1467,456,167,21,1363,1173,394,318,1601,1111,1249,757,282,672,1227,1214,277,336,815,136,1192,681,689,431,130,1488,154,465,14,709,339,1123,68,151,1280,143,1797,23,250,1231,1007,302,1103,2,585,552,1732,994,225,771,1495,82,229,700,910,15,38,159,1122,316,1044,711,1436,920,1722,523,1398,188,443,1032,93,33,397,272,187,24,489,53,79,1277,671,1094,68,1705,984,1096,512,145,389,167,161,1174,94,4,534,1295,648,75,24,366,995,175,220,714,843,412,267,634,1209,66,1094,125,822,1114,1513,694,1520,30,676,817,245,26,77,1146,552,143,165,39,343,971,87,0,90,1434,588,616,99,297,1034,114,5,702,917,582,733,31,54,820,0,212,192,282,33,639,1661,460,75,680,115,178,194,271,274,582,1008,89,139,611,707,0,376,65,9,161,135,40,134,566,66,601,95,817,745,202,352,447,322,842,6,1247,175,468,330,608,368,139,21,29,486,121,9,1293,298,73,328,302,145,889,1794,677,56,952,520,80
diff --git a/7.jl b/7.jl
new file mode 100644
index 0000000..26793a3
--- /dev/null
+++ b/7.jl
@@ -0,0 +1,14 @@
+function solution7(costfunction)
+    start = parse.(Int, split(readline("7.data"),","))
+    min(map(x -> costfunction(x, start), min(start...):max(start...))...)
+end
+
+function solution7_1()
+    solution7((x, positions) -> sum(abs.(positions .- x)))
+end
+
+function solution7_2()
+    solution7((x, positions) -> sum(div.(map(n->n * (n+1), abs.(positions .- x)), 2)))
+end
+
+solution7_1(), solution7_2()
diff --git a/7_ex.data b/7_ex.data
new file mode 100644
index 0000000..18bd32a
--- /dev/null
+++ b/7_ex.data
@@ -0,0 +1 @@
+16,1,2,0,4,2,7,1,2,14
diff --git a/8.data b/8.data
new file mode 100644
index 0000000..a4de956
--- /dev/null
+++ b/8.data
@@ -0,0 +1,200 @@
+dcagfb cbegda cabdf bagedf dcb cd dcbegaf aebcf bgdaf dgcf | dacebgf cbafd dbacf cdgf
+dfgbc ceagbd egb cgdae eafcgd ecbgd eb aefbgcd bfaceg deba | baed ecabgd aebd cadfebg
+acbd bagfec bedcf efbca dbfecag gadcfe dc dbcaef cde fbegd | deacfg bfagcde bgedf cde
+dgec dfc fabgd bfcgae dfbcg baegdcf cd fbdace cdbefg becgf | cedg adfbecg badgf dgbfc
+be bacedg dfacb fbge deagcf eba egacf gcebfa febac dbgacfe | befg be egbf aedgcbf
+gafbd gbafce agced fdgae bcedgaf gdeacb efdc eaf fe cgeadf | cgdae fdec fcdeabg ef
+cdaefgb cfadbe gc afgcbe afedcg faecb cabg egc bfgde bfgce | fbaedc gc abgc bfcea
+egcafb adgecf caebf fdgbaec fbaed cebg facbgd cfe fgabc ec | fbgca deagfc ce ce
+fcdab deb cdbfea fecb befcdga abecd gdcae efbgda fcdgba be | cfbad dacge gbdeaf bed
+afdecg gfcadb ecadfbg facgd ed egda efbgc ecd cdegf bfadec | becgf fcbeg de cgefb
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+dbfaec bfcgae cdb cdaf defbcg abgde ceabf adceb decgafb cd | fcda bdc dc afgecb
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+ef dgfbc cefbg gabecfd agceb feg gbcadf dfbe fcdgeb dfagec | gfe cafegd dfeb fe
+ebgdc egdacb dfbcega dfe dbfge bagef ecdbfg bdcf df fgecad | dbgce fd cfdb edf
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+acd cafg abedcgf cfebda efcbgd cegfd ca cdgafe agcde bgeda | egcfbda gcfdae gefacd dca
+dcefga gdefa db fbaed abefdgc faebc fbgaed bdf gbed dcafgb | bfd db db gbdfae
+befac abcd bdcfe ecd cd baegfc edfgca adfbce aebcdgf edbfg | cgedfab feabc cd dabc
+eacdgf cebgdfa acgebd ecdba dbcfea fdgcb dag ga acgdb abge | ag ga adg ag
+gca fagbe dfageb bagce ecgfab gfce gc dcfeabg fadbcg bedac | afbdceg gadfeb cga acbdfg
+gbad febac dea gadbecf fdegbc edfacg da bdecg cdbea bdcgae | dbag cdeabg gcdaeb adbg
+cdgfeb cbeaf adef cfa fa aecbg fedcb acdebf bdcfga cdefbga | fdea eadf efad caefb
+aedgb df cgbaed gdef bfcgda bfd efbac dgfeab debfa aegcbdf | acbfe egfd afebgd gefd
+badcfe fcbg bf dfecbga faged gfadbc dfb dfgab abdcg dbceag | bf fb dafbgec fbd
+bdae decgbf afcbge bdecfa afcbd edgfcab ebcaf bd dfacg dbc | ebda db cbd cbd
+acfgde ae eac agbdec gadcb ebgcafd baed gfcbe cgabe bfgadc | cea fecdga ebgdac eac
+cbedga cfb adcbe bfae afcdgeb cgdaf fcedab bf fcbdeg dacbf | dfceba fcdga fbc fcebda
+cdafg dfgeac fc dbgcef gadbc gacfebd dcf edfgab gefad caef | fadgc facged adgefb ecgbdaf
+gdcbf eabdgf gaefd fbdge afcedg bacgfe fagbedc dbea efb be | ecagfb dgaef be eb
+gbecad faced abgedf cd cbfd abedcf dacgbfe cde deabf agcfe | cd edbfac cgabed daebfg
+cgebaf dacbge gafed eadbgf dgcef ad fadgbce dea bgafe dafb | fegad dgeaf ad gdfae
+ecfadb eagdbc afbcdge abfcgd cf bgedf agfc cfd gbfdc bcagd | fcga fcd befgd gdbfc
+afcbg gfeb gfcad ecgdba cbf cafbeg bacge fb ebdfac baedcfg | fbc gabce egabc fcadg
+agd gadbc da agcfed gcebad dgfcb ecabg ebcagdf eadb becfag | fgbeadc bcega geacb gceab
+gaebf gfdbce aefbgd fde aefcbg ed dcaebfg agde aefdb acfdb | efd agcdebf cbgefd ebgfa
+cdgfe ecbafd ebgca ad gedbcfa cad adbg cedabg egcad fcebga | gbedac adgb ecdgab daceg
+efcb fcdag begdfa egcdf edf fe gfcdeb cdbega geacdbf becdg | dagfc gbadef decbg fe
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+abd fdbcae aedfb daec ad bacfdg dgefcb agbef cbefd cbagdef | ad dab acde da
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+dbecf egadfb cfagde da fcebga cagef dae fadec dagc dfbcaeg | da dgac bfedc ad
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+fecga eafgd acgefb cf gceab fbcdag gecdafb cabedg fbec gcf | agcbfd gfc cgf ceagf
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+afdcgb decgb fbdegca fbgae fdbaeg dgfbe gbafce df fdb efda | gcbed dafe gbfdca aefgb
+gaebd baefg cfadbg fb gaedfbc gadbef cfgea bfde baf gacdeb | abf cdbagf aecbdg fagec
+cfdb dcg geadbf febdg edfabcg dc bgecd eabcg fcgead cgbfde | dgc dc bdfge dcfebga
+dfbcaeg fdgcae gfdab bagc gabcdf fecbgd cadgf gb fbade bdg | bdg gacb bgac ecfbdg
+eg befdg fceabd badfg dbecf egbcfa bedgcf gbacefd egb dceg | beg faecdb gfdbe dbacef
+cdagef edfca dgfa fca fa agedc gfcabe bdfec bdcage fbcaedg | caedbfg ecafgbd fdcega decgfba
+gfc cfeb cafgdb fc aedgbfc cgdfe degfb aedcg fbegcd dfgbea | acdge fedbg agedc ebgdfa
+aegdcb gde dgbfca eg bdecfga fedbgc gcbfd fgecd bfge acefd | ge debcag bgedcf bfeg
+gbd eagbc cbefagd gcde aefdb gcebad cgdafb dg aegbd facbge | cdeg cged ebdaf gbd
+eagbcf cba aebd cdfga cdegbf afcbedg dcbfe ab adfcb acfbde | bcfeag fgdcbe daeb bdae
+gc dabcfg dcfageb acg ecabf bgadef facge gfeda ecdg fagced | gcde efdga agc fgaed
+bcgdea bacfdg aeg cdabg dfeagc befgd aebc dabfgec ae degba | ebfdg egadcf aceb gbdac
+ceadf defagb fg agbed dfgaebc bfaecg eacdbg afgde efg fgbd | gf egbda fabegc badfgec
+begcfd fdecb fbdga ca bace cfadb egfdca cda cfaedb efabdcg | gacefd fdgba fcdebg bcae
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+dc fgebad ecd aedcfb cdga ebcagd dfbaecg adebg debcg gbecf | bcegd gcdeb dacg eagdb
+cad feabgd fadegc bgcdfea gbcfa bgcda bgaced decb dc ebadg | acd adfbge cd dc
+af cfbge fadecg afbgc dbaf gbdfac bdgeacf dbcga cfa gebcda | fa dabcg dafb gbceda
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+fbeda ae dae bdgfe gcadbf beac fedabc badfc ceagfd dgcbafe | bfcad gfabdc aed fbdac
+fgcaed bagcef bdfc edabg efacd ebcadf fb afb abefd agfbdce | cfdb fb abf abf
+fed bfaedc fceab edabg bfdea ecdagf begfdac df fceabg bfcd | cebgfa df eagbd gafced
+egfdc fcg cadg dfebc dfebcga cg dgabef ebgacf dfgea gcfade | fbedc gcfed dcag fgc
+fcbde fbeacgd afedb da fcegda dabg ebgaf dgfaeb dea febagc | da bfdce egfacb ad
+fcdeg cdbe fgcab dceagf febcg eb cebdgf geb edfgab dbgcaef | abgcfed bdec gdcfe cfgdbe
+degfb ebdacf edbfcg agdfce dbf bd bgcd dgfce gfdcbae abegf | gebfcd fgeab gecdfb gdafcbe
+egacd abedg decfgba dagceb ca cabe cag dagfcb badfeg cegfd | gca caeb cfgde ca
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+dbec fcd cegbdf dc fdacgeb abdfg baefcg gbfcd dafgce gfbec | dcf cfd fcd agefcb
+fcdeg gdefb cfgadbe fb bef bfcg edfacb fecdgb gcdfea gadeb | efb feb fbcg dabge
+acebd dacfg bdf agdcbfe gcafdb fcegad afgdbe bcfg bfcad bf | dbf bdaec bf febacdg
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+efacgd bfda bcadg gab gbceadf ab cfbdga gadfc bcgfae dgbec | fgecad dbaf ba abfgdec
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+cagb fgcdeab gdebaf fcegd ecabfd acfeg ag afceb fga acgbfe | ga agf bcadfe fag
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+febadcg cfdbge bgcef gecd ed gbdaf bfdeg deb gfabce fcbead | efdbca ed fgcbe cebdaf
+eagbc cgde cafbg abdge fbdgae gacedb aec ec acefbgd abcefd | bgacf cgbfeda agbed dgec
+efgbdca gfdb cadbfg dag dg degfac bcdaef gdacb bfcad agebc | gda dfagecb gcfdea dag
+gefab bfde acbfgde gfdac ebfgad bfgeca aegbcd eda gfade de | gafbce gcfeabd aefgd fgbcae
+gaecfb cdebgf fec ebcafgd bgecad cf debgc bfead ebfdc cgdf | cdbfe gfcd egbdca edfcgb
+cfdeba bfgd gcedfa gbdae dgefcab cbega dg febadg agd bdaef | dfgb adg gecdfa fcebda
+dea bgdeaf da befdc gdcfaeb ecdbga abecd gacd bgafce eagcb | aedcb facebg abfecdg bagefdc
+gcebf dfbae dbgcfe egdc dgebcaf febcd bcd cagfeb fdgcba dc | bcd efcbd daefb agbdfce
+fa acged bdfec afeg gcfadb bfdagce ecgafd caf acdfe dgaecb | debfc af afge adegc
+bacfdg fadbe egbdfc ba bage acefd baf bgdafe fgebd gdacbef | dbfage bgedf aedgbf acedf
+acgb dgcbfa dba edgbfac acdefb begdf bdgfa dceafg dcagf ba | abd dfbge abd gacb
+gcdea gc agfdce egdfa egcf fbeagd aecbd dgc fcebgad cagfbd | acebd egcf defag gfadceb
+fab begadc ebcad dfbea gfcdab acdfgbe fa fedgb adcfbe feca | cbgead bfcdega fba gbadce
+gb efcagd fgcad cfbg bedca abg fcgbda dgbcafe acbgd bdafeg | abcdgf bcgf cgfb bg
+fbcagd fcdae beacgf gf agf baecdg fecag bgfe cagdbef gbcea | edbagfc ebfg gebf bgcae
+cdgfea bdeacf aefcgb dbca beafc bcgdefa ebdgf ad defab ade | dbcgefa da ade bacd
+bcgaedf badecg cfegb afceg dcbf egdbfa gcedb gbf bf fgcdbe | bagfed bdagfe fdbc gefcbd
+cegba bgeda cgefa cbde fegadb dagcbe acfgdb cb cbg ecbdafg | cdegabf ebgda bfgade ebgac
+afbdg gdabec gcafdeb fc cfdeba bcf fgebdc cefg gcdbf ecdbg | fecg cdbefg gdbfc gfce
+bgdfa egbf bcdgfa fe dfcbea aef feadgb edcag dagef afdcegb | fea cbedfa acdfgeb dfgeab
+eacgfd caegdb gbfecad bdfce edcfa dgaf fea fa egdac aegbcf | af fa edbcf gdeacbf
+baefg fedabcg gbfac gacbfe cb dfageb dcfag cgb bcea cfdegb | cabe eabc gfacd fgdcabe
+fgdeac cgd ebdfga agefdbc bfcegd cdgbf cd cfabg dceb befgd | cgd cfgab fdgeb efbgd
+aedgbf cgebda dbcagf gbf gbefd gdecf gdfabec fb eabdg feab | bf fbea cefdagb adgbe
+fcgea fbgedca gbecfa efbadc efgd fcagd df cdfaeg fdc acgdb | efgac fcd dfceba fegac
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+be abcged afcgb ebg bgefc gebfcd cgefd efdb gdeafc daecgbf | gabedc dbeafcg debf febcadg
+dgebafc cefdbg db edfb fcgdb fdceg dgecfa bdc abcfg baecdg | fegdca baecdfg bcd bd
+fbgead cfab cdbgefa agcbdf aedgc fgcbd fa fagcd ecgbdf gaf | adgcebf gaf gaf af
+debagfc eb fcedba ebc cgdab efdgac befa eadcf edabc gdbefc | bcdagfe fbae ecadb eabf
+gaedcb bfcgd bcegf bagdcf fd aedfgbc bfd cbdga cabefd adfg | ecfbda cbfgda cfbadg fbgcd
+agdcfbe bcfega cbeag ge dacfeb facged bcaef gbdac gce efbg | feabc acfbdeg aefbc gce
+febcdg egdacb bedcf debfacg abdfce ba bae fbeda gdfea acfb | eadbf ab ab eab
+cdfbg dfbcae dcabe egba ag cgdfea abdcg aefcdgb cga decagb | defabc edacb cbfgd ag
+fgac dfgec eag cfbdge bacde ag abdgef bagfdec dcgfae agcde | aecbdgf gcaf efcgd befcdg
+de gecad fbcgae gcafd dge edfbcg eadb eacfdbg bcedag acbge | gabce fcegba bgfcead ed
+gbacd dbefcg fdcgae edgca afdeg aecf egc gfaedb dcfagbe ce | feac acegd caefbdg aecf
+egacbd aedbc dagbc fcdagb ec bacefdg ace dcge ecfagb febda | afecgb fgdbac bcade cea
+ceadgb cgaedf bfdge cfg cf fdgbc dgabc cfdabg gdcebaf bacf | gebdf fdeacg dafbgec cgf
+bgfda gdcfae afce bfecgd ac acdfg afebdgc dgefc bdcaeg cag | gdbfec gcedf gfdaceb cegdab
+fa fgeabdc bfga faedb fad ebgdfa daceb fgbcde fgdeb dafcge | efdab gcdfeb fa gabf
+ebfc fb aedbgc ebagdf fab cgfeab gcdfeba acbeg abcfg gfdca | gbfac bgfeac bfa bcfga
+fagdec gadebc cg cabfegd agdfb cbge dbeac cdfabe adcbg cgd | acgbed dgfeabc fdeacb dgbacef
+fgbdc gbedaf bdgaf dfc cbfadg gfceb degcfa dc bacd gbafcde | dcf egfdca cd cdegaf
+fcb aebf bf cafgb efgabc cgadbe egbadfc egbca gcfebd acdgf | beacgfd gebfcd dfbgec bf
+bfgcd deb bfacdg ed fcebgd baefg dbaecfg efdc dabecg fdgbe | de gebaf dbcgfe bde
+facgdbe gda ebdfag gabdf da cagfeb gebaf deaf dbagec dcfbg | egfba dgebca aefd cgdbf
+deabg eg gdfacb bdfea egd gebfdca ecdgab acge dacbg cefgbd | eg dgcbef agcdb fadbceg
+cafbged feacb gbafd dc gfdc agdcbf fcabd deabgf cad acgedb | fdcba egbfdac cad dca
+dfagce fbd eabdfc gdfeb ebgfa dfabcge fdgce cedfbg bcgd bd | cdbg agbcefd db db
+fdagec fcg gf gbace efbgacd ecgbfd dfcea caefg dagf dbecaf | acdegfb fg gbdfaec fadg
+edfag bgfced dga ag cfbgdea bfdcag bfged decfa afedbg bgae | abeg dgaef ag edfgb
+dcaegb fageb cdga begda adbce gd dge gbecafd cabfed cgfebd | gdaebc ged egd dcga
+cfb agebfc fegb fb adcef afbec ebgdca bafdgc gbcea fdbeagc | ebfg gabce fbc agfdceb
+fdcega cbgfea febg agdebfc cfe afecb gbcae ef bcdfa acgedb | fbgdeac egbf acfgeb bfge
+fbadge dfgebc fbgacde bg fdage afdcge cedba agbf bge dgbea | adgbe fgba gabf fceagd
+cfbda bgedca fgdcba abcfe dc agbfd dbc fdgc facbged dagfeb | cd fbcda fdcab fdgc
+cdefa fbgdce aebdg geacd ebcdgfa gc cdg baegdc febdag gbac | fdeca cg dgfbcae bcgfde
+gcadeb ef ecbfga acbgfed fbdga bcade dafcbe dcfe deabf feb | fdegacb agdbf fgbedac fcdbaeg
+adgc fac ca gdfcae cfdegb gcdef adcfbe dgefcba cagef abgef | gcadbfe feabdc cdefg bgdeafc
+cfdeba dega fga gadfec cdfabeg aecbfg cbdfg ag faedc dfcag | ag ga acfed cebfad
+efcgb feagdc gdfbea fadc ac cea gadbfce cfgae aedgbc geafd | fcgeabd cafeg cbadge ca
+ebfda cfgbea cgdbef fbadgec dgcb cedfga dg fdbeg efcgb gfd | fgdeb bfgcde ebfdg dg
+dcafg facgdb bgfa dbacf ba gdcefa ecfdb cfegdba bac acedbg | gcbdaf fbadc begdac dgcbaf
+eagf agedbcf acdegb abg gcfba fcegb befgcd fbcda ag ebcfag | dbcegfa bfecg cafdebg faeg
+fbgcd cba fgacdb gabcdef fbgdec gdabc gacf bafdec begad ac | eacbdf badge acb becfad
+eacbd dabfec dbgfeac ag eagdb fcdbag bga agec dbfge bacged | agecdb bag gebcdaf cdbea
+bfgcd bcdegfa fdabgc da efgca cfagd efbdca cda dgfecb bgda | acdebf badfcg abdg cafgd
+efcbgd cadefg cfegd dcgba cafedgb cagfd gaf acef fa bedafg | agf fcedg gefdcb cfdge
+afdceg dcaf fd dfg aefgc gdbecf cafbdeg dbage ecagfb deafg | adefgc bfdecga fdg cefag
+bfdacg dagbf abdefcg acfg fbcda beafdc egdab cfdegb gfd gf | bcafgd efgcabd cfga dcaegfb
+dbage dfagbe cadfeb gfeb bae fabgdc be bafdg cdgea bgdfaec | fedacbg eb dfcbea eab
+gebfd cfedga begfa dagbfc fgeadcb ecdgbf bced edfgc dgb db | dbec gadcfb db aefbg
+dbcg fbagc bcf bc cdaebgf aegbdf faecg fdcaeb cdafbg afbgd | adfbg fadebgc dgbafc febagd
diff --git a/8.jl b/8.jl
new file mode 100644
index 0000000..c1896f9
--- /dev/null
+++ b/8.jl
@@ -0,0 +1,96 @@
+include("utils.jl")
+
+function parse_input(filename)
+    map(non_empty_lines(filename)) do line
+        notes, output = map(split, split(line, "|"))
+    end
+end
+
+function count_unique(strings)
+    length(filter(x -> x in (2,3,4,7), length.(strings)))
+end
+
+function solution8_1()
+    sum(map(count_unique, getindex.(parse_input("8.data"), 2)))
+end
+
+function solution8_2()
+    summe = 0
+    for (notes, output) in parse_input("8.data")
+        recordings = [notes;output]
+        # find length 2 => c,f
+        cf = first(filter(x->length(x)==2, recordings))
+
+        # find length 3 => c,f,a => a
+        cfa = first(filter(x->length(x)==3, recordings))
+        a = setdiff(cfa, cf)[1]
+
+        # find length 4 => c,f,d,b => d,b
+        cfdb = first(filter(x->length(x)==4, recordings))
+        db = setdiff(cfdb, cf)
+
+        d = "X"
+        b = "X"
+        f = "X"
+        c = "X"
+        # find length 5 =>
+        for fives in filter(x->length(x)==5, recordings)
+            common = intersect(fives, db)
+            if length(common) == 1
+                # is there one missing d,b? => present is d missing is b
+                d = common[1]
+                b = setdiff(db, d)[1]
+            else
+                # is there one with d AND b => has one of c,f => f (and thus c)
+                f = intersect(fives, cf)[1]
+                c = setdiff(cf, f)[1]
+            end
+        end
+
+        abcdf = "$a$b$c$d$f"
+
+        g = "X"
+        for sixes in filter(x->length(x)==6, recordings)
+            new = setdiff(sixes, "$a$b$c$d$f")
+            if length(new) == 1
+                g = new[1]
+            end
+        end
+
+        abcdfg = "$a$b$c$d$f$g"
+
+        e = "x"
+        for anything in recordings
+            new = setdiff(anything, abcdfg)
+            if length(new) == 1
+                e = new[1]
+                break
+            end
+        end
+
+        digits = Dict(sort(collect("$a$b$c$e$f$g")) => 0,
+                      sort(collect("$c$f")) => 1,
+                      sort(collect("$a$c$d$e$g")) => 2,
+                      sort(collect("$a$c$d$f$g")) => 3,
+                      sort(collect("$b$c$d$f")) => 4,
+                      sort(collect("$a$b$d$f$g")) => 5,
+                      sort(collect("$a$b$d$e$f$g")) => 6,
+                      sort(collect("$a$c$f")) => 7,
+                      sort(collect("$a$b$c$d$e$f$g")) => 8,
+                      sort(collect("$a$b$c$d$f$g")) => 9)
+
+        result = 0
+        power = 0
+        for digit in reverse(output)
+            value = get(digits, sort(collect(digit)), -1)
+            result += value  * 10^power
+            power += 1
+        end
+        # println("$(join(notes, ' ')) | $(join(output, ' ')): $result")
+        summe += result
+    end
+
+    summe
+end
+
+solution8_2()
diff --git a/8_ex.data b/8_ex.data
new file mode 100644
index 0000000..c9f629b
--- /dev/null
+++ b/8_ex.data
@@ -0,0 +1,10 @@
+be cfbegad cbdgef fgaecd cgeb fdcge agebfd fecdb fabcd edb | fdgacbe cefdb cefbgd gcbe
+edbfga begcd cbg gc gcadebf fbgde acbgfd abcde gfcbed gfec | fcgedb cgb dgebacf gc
+fgaebd cg bdaec gdafb agbcfd gdcbef bgcad gfac gcb cdgabef | cg cg fdcagb cbg
+fbegcd cbd adcefb dageb afcb bc aefdc ecdab fgdeca fcdbega | efabcd cedba gadfec cb
+aecbfdg fbg gf bafeg dbefa fcge gcbea fcaegb dgceab fcbdga | gecf egdcabf bgf bfgea
+fgeab ca afcebg bdacfeg cfaedg gcfdb baec bfadeg bafgc acf | gebdcfa ecba ca fadegcb
+dbcfg fgd bdegcaf fgec aegbdf ecdfab fbedc dacgb gdcebf gf | cefg dcbef fcge gbcadfe
+bdfegc cbegaf gecbf dfcage bdacg ed bedf ced adcbefg gebcd | ed bcgafe cdgba cbgef
+egadfb cdbfeg cegd fecab cgb gbdefca cg fgcdab egfdb bfceg | gbdfcae bgc cg cgb
+gcafb gcf dcaebfg ecagb gf abcdeg gaef cafbge fdbac fegbdc | fgae cfgab fg bagce
diff --git a/8_ex_mini.data b/8_ex_mini.data
new file mode 100644
index 0000000..42b3bfd
--- /dev/null
+++ b/8_ex_mini.data
@@ -0,0 +1 @@
+acedgfb cdfbe gcdfa fbcad dab cefabd cdfgeb eafb cagedb ab | cdfeb fcadb cdfeb cdbaf
diff --git a/9.data b/9.data
new file mode 100644
index 0000000..05ef6df
--- /dev/null
+++ b/9.data
@@ -0,0 +1,100 @@
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diff --git a/9.jl b/9.jl
new file mode 100644
index 0000000..958924c
--- /dev/null
+++ b/9.jl
@@ -0,0 +1,86 @@
+include("utils.jl")
+
+function parse_input(filename)
+    map(x->parse.(Int, x), split.(non_empty_lines(filename), ""))
+end
+
+function sink_locations(width, height, heights)
+    sinks = []
+    for x in 1:width
+        for y in 1:height
+            minimum = true
+            if x > 1
+                minimum &= heights[x - 1, y] > heights[x, y]
+            end
+            if x < width
+                minimum &= heights[x + 1, y] > heights[x, y]
+            end
+            if y > 1
+                minimum &= heights[x, y - 1] > heights[x, y]
+            end
+            if y < height
+                minimum &= heights[x, y + 1] > heights[x, y]
+            end
+            if minimum
+                push!(sinks, (x, y))
+            end
+        end
+    end
+    sinks
+end
+
+function solution9_1()
+    input = collect(parse_input("9_ex.data"))
+    width = length(input[1])
+    height = length(input)
+    heights = reshape(reduce(vcat, input),(width,height))
+    sinks = sink_locations(width, height, heights)
+    risk = 0
+    for sink in sinks
+        risk += heights[sink[1], sink[2]] + 1
+    end
+    risk
+end
+
+function basin_size(x, y, width, height, heights)
+    heights = copy(heights)
+    to_visit = [CartesianIndex(x, y)]
+    visited = []
+    while length(to_visit) > 0
+        current = pop!(to_visit)
+        if current in visited
+            continue
+        end
+        push!(visited, current)
+        if heights[current] == 9
+            continue
+        end
+        if current[1] > 1
+            push!(to_visit, CartesianIndex(-1, 0) + current)
+        end
+        if current[1] < width
+            push!(to_visit, CartesianIndex(+1, 0) + current)
+        end
+        if current[2] > 1
+            push!(to_visit, CartesianIndex(0, -1) + current)
+        end
+        if current[2] < height
+            push!(to_visit, CartesianIndex(0, +1) + current)
+        end
+        heights[current] = -1
+    end
+    length(filter(==(-1), heights))
+end
+
+function solution9_2()
+    input = collect(parse_input("9.data"))
+    width = length(input[1])
+    height = length(input)
+    heights = reshape(reduce(vcat, input),(width,height))
+    sizes = map(sink_locations(width, height, heights)) do sink
+        size = basin_size(sink[1], sink[2], width, height, heights)
+    end
+    reduce(*, Iterators.take(reverse(sort(sizes)), 3))
+end
+
+solution9_2()
diff --git a/9_ex.data b/9_ex.data
new file mode 100644
index 0000000..6dee4a4
--- /dev/null
+++ b/9_ex.data
@@ -0,0 +1,5 @@
+2199943210
+3987894921
+9856789892
+8767896789
+9899965678
diff --git a/utils.jl b/utils.jl
new file mode 100644
index 0000000..6769e0c
--- /dev/null
+++ b/utils.jl
@@ -0,0 +1,3 @@
+function non_empty_lines(path::String)
+    Iterators.filter(!isempty, eachline(path))
+end