Initial commit

2021-12-22 11:33:30 +01:00
commit cd6cc0be1e
73 changed files with 10338 additions and 0 deletions
@@ -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()