43 lines
1.1 KiB
Nix
43 lines
1.1 KiB
Nix
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{lib, ...}: {file}: rec {
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rawContent = builtins.readFile file;
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content = lib.strings.removeSuffix "\n" rawContent;
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lines = lib.strings.splitString "\n" content;
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getLeftAndRight = s: s
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|> lib.strings.splitString " "
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|> map lib.strings.toInt
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;
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splitLists = s: s
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|> map getLeftAndRight
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|> builtins.foldl'
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(prev: next: {
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left = prev.left ++ [(builtins.elemAt next 0)];
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right = prev.right ++ [ ( builtins.elemAt next 1 ) ];})
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{left = []; right = [];}
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;
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sortLists = l: {
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left = lib.lists.sort (a: b: a < b) l.left;
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right = lib.lists.sort (a: b: a < b) l.right;
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};
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distance = l: l
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|> sortLists
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|> ({left, right}: lib.zipListsWith (ln: rn: abs (ln - rn)) left right)
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;
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total = l: builtins.foldl' (x: y: x+y) 0 l;
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abs = n: if n > 0 then n else -n;
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getDiff = s: s
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|> splitLists
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|> distance
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|> total
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;
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similarity = l: l
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|> ({left, right}: map (ln: ln * lib.count (rn: ln == rn) right) left)
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;
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getSimilarity = s: s
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|> splitLists
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|> similarity
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|> total
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;
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part1result = getDiff lines;
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part2result = getSimilarity lines;
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}
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