Initial commit

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()