51 lines
1.3 KiB
Nix
51 lines
1.3 KiB
Nix
# nix eval -f ./day_2.nix part1
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# nix eval -f ./day_2.nix part1 --arg input 'builtins.readFile ./puzzle_cache/day_2_1'
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# nix eval -f ./day_2.nix part2
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# nix eval -f ./day_2.nix part2 --arg input 'builtins.readFile ./puzzle_cache/day_2_1'
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{
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input ? (builtins.readFile ./puzzle_cache/day_2_0),
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}:
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with builtins;
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with import ./utils.nix;
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let
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# reversedChars =
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# str:
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# let
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# len = length str;
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# in
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# builtins.genList (i: builtins.elemAt str (len - 1 - i)) len;
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isStrPatternSplit =
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str:
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let
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strLen = stringLength str;
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in
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(
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if mod strLen 2 == 0 then
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let
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half = strLen / 2;
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firstHalf = substring 0 half str;
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secondHalf = substring half strLen str;
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# secondReversed = reversedChars secondHalf;
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in
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firstHalf == secondHalf
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else
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false
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);
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ranges = map (range: map (v: toIntBase10 v) (split "-" range)) (split "," input);
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fullRanges = map (itr: map (v: toString v) (rangeInclusive (elemAt itr 0) (elemAt itr 1))) ranges;
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invalidIds = flatten (
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map (
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range:
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(reduce (
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invalidIds: id: invalidIds ++ (if isStrPatternSplit id then [ id ] else [ ])
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) [ ] range)
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) fullRanges
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);
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invalidIdNums = map (v: toIntBase10 v) invalidIds;
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invalidIdSum = sum invalidIdNums;
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in
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{
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part1 = invalidIdSum;
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part2 = 0;
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}
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