35 lines
946 B
Nix
35 lines
946 B
Nix
with import ../util.nix;
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let
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# read file
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input = readFile ./input;
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matches = map (line: convertMvId (splitString " " line)) (splitString "\n" input);
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# convert moves to numbers for opponent and player
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# Rock -> 0, Paper -> 1, Scissors 2
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mvId = c: m: (charToInt m) - (charToInt c);
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convertMvId = split (a: b: [(mvId "A" a) (mvId "X" b)] );
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# scoring matches
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isWin = a: b: (mod (a+1) 3) == b;
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isTie = a: b: a == b;
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getScore = a: b:
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b + 1 + # add score for the move itself
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(if isWin a b then 6
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else if isTie a b then 3
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else 0); # loss
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totalScore = m: sum (map (split getScore) m);
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# part 2
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mkDraw = a: a;
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mkWin = a: (mod (a+1) 3);
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mkLoss = a: (mod (a+2) 3);
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bestMove = a: b:
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if b == 0 then mkLoss a
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else if b == 1 then mkDraw a
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else mkWin a;
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makeBestMoves = map (split (a: b: [a (bestMove a b)] ));
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in {
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part1 = totalScore matches;
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part2 = totalScore (makeBestMoves matches);
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} |