Day 🐱‍👤

day13/Project.toml

@@ -0,0 +1,4 @@
+name = "day13"
+uuid = "247b46b5-f226-4f99-8c0d-068ba1fc2a6d"
+authors = ["HeNine "]
+version = "0.1.0"

day13/data/case00.txt

@@ -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

day13/data/case01.txt

@@ -0,0 +1,828 @@
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+
+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

day13/src/day13.jl

@@ -0,0 +1,102 @@
+include("../../AoC2021.jl")
+
+##
+
+function parsefile(file)
+
+    points = []
+
+    for line in eachline(file)
+        if line == ""
+            break
+        end
+
+        push!(points, (split(line, ",") .|>
+                       Base.Fix1(parse, Int)) |>
+                      x -> (x[1], x[2]).+1)
+    end
+
+    paper = zeros(Bool, maximum(map(((x,y),)->y, points)),maximum(map(((x,y),)->x, points)))
+
+    for (x,y) ∈ points
+        paper[y,x] = true
+    end
+
+    folds = map(eachline(file)) do line
+        matches = match(r"fold along (?<axis>[xy])=(?<coord>\d+)", line)
+
+        (matches["axis"] == "x" ? Val(x) : Val(y), parse(Int, matches["coord"])+1)
+    end
+
+    (paper, folds)
+end
+
+@enum Axes x y
+
+function foldpaper(paper, ::Val{x}, coord)
+    folded = paper[:, end:-1:(coord+1)]
+
+    foldedpaper = paper[:, 1:(coord-1)]
+    foldedpaper[:, (end-size(folded, 2)+1):end] .|= folded
+
+    foldedpaper
+end
+
+function foldpaper(paper, ::Val{y}, coord)
+    folded = paper[end:-1:(coord+1), :]
+
+
+    foldedpaper = paper[1:(coord-1), :]
+    foldedpaper[(end-size(folded, 1)+1):end, :] .|= folded
+
+    foldedpaper
+end
+
+##
+
+function task0(file)
+    (paper, folds) = parsefile(file)
+
+    sum(foldpaper(paper, folds[1]...))
+end
+
+##
+
+verify(13, 1, 0, 17)
+verify(13, 1, 1, 693)
+
+##
+
+function task1(file)
+    (paper, folds) = parsefile(file)
+
+    folded = foldl((paper, foldins) -> foldpaper(paper, foldins...), folds, init=paper)
+
+    eachrow(map(x-> x ? "█" : " ", folded)) .|>
+    (x->join(x,"")) |>
+    (x->join(x,'\n')) |> println
+
+    folded
+end
+
+##
+
+verify(13, 2, 0, 
+[
+    1  1  1  1  1
+    1  0  0  0  1
+    1  0  0  0  1
+    1  0  0  0  1
+    1  1  1  1  1
+    0  0  0  0  0
+    0  0  0  0  0
+])
+verify(13, 2, 1, 
+[
+    1  0  0  1  0  0  1  1  0  0  1  0  0  0  0  1  1  1  1  0  1  1  1  0  0  0  1  1  0  0  1  1  1  1  0  1  0  0  1  0
+    1  0  0  1  0  1  0  0  1  0  1  0  0  0  0  0  0  0  1  0  1  0  0  1  0  1  0  0  1  0  0  0  0  1  0  1  0  0  1  0
+    1  0  0  1  0  1  0  0  0  0  1  0  0  0  0  0  0  1  0  0  1  0  0  1  0  1  0  0  1  0  0  0  1  0  0  1  0  0  1  0
+    1  0  0  1  0  1  0  0  0  0  1  0  0  0  0  0  1  0  0  0  1  1  1  0  0  1  1  1  1  0  0  1  0  0  0  1  0  0  1  0
+    1  0  0  1  0  1  0  0  1  0  1  0  0  0  0  1  0  0  0  0  1  0  1  0  0  1  0  0  1  0  1  0  0  0  0  1  0  0  1  0
+    0  1  1  0  0  0  1  1  0  0  1  1  1  1  0  1  1  1  1  0  1  0  0  1  0  1  0  0  1  0  1  1  1  1  0  0  1  1  0  0
+])