13 lines
362 B
Nix
13 lines
362 B
Nix
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{ lib, utils, ... }:
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with lib;
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with builtins;
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with utils;
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let
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numbers = map (l: map toInt (splitWhitespace l)) (readLines ./input);
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left = sortOn noop (map (flip elemAt 0) numbers);
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right = sortOn noop (map (flip elemAt 1) numbers);
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in {
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part1 = listSum (zipListsWith delta left right);
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part2 = listSum (map (x: x * (count (y: x == y) right)) left);
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}
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