83 lines
1.4 KiB
Python
83 lines
1.4 KiB
Python
from pathlib import Path
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WINS_OVER = {
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"A": "C",
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"B": "A",
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"C": "B",
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"X": "C",
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"Y": "A",
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"Z": "B",
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}
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BASE_SCORE = {
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"A": 1,
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"B": 2,
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"C": 3,
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"X": 1,
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"Y": 2,
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"Z": 3,
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}
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def score(a: str, b: str) -> int:
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result = BASE_SCORE.get(b)
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if BASE_SCORE[a] == BASE_SCORE[b]:
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# Draw
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result += 3
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elif a == WINS_OVER[b]:
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# Win
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result += 6
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return result
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def winning_shape(other: str, goal: str) -> str:
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if goal == "Y":
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# Draw
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return other
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if goal == "X":
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# Win
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return WINS_OVER[other]
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if goal == "Z":
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# Lose
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return next(k for k, v in WINS_OVER.items() if v == other)
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# Setup
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# Example data
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# data = """
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# A Y
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# B X
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# C Z
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# """
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data = (Path(__file__).parents[1] / "input").read_text()
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# Problem solving - part 1
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scores = [
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score(*parts) for line in data.splitlines() if (parts := line.split(maxsplit=1))
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]
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total = sum(scores)
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print(total)
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# Problem solving - part 2
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assert winning_shape("B", "Z") == "C" # Win against paper -> scissors
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assert winning_shape("B", "Y") == "B" # Draw against paper -> paper
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assert winning_shape("B", "X") == "A" # Lose against paper -> rock
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scores = [
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score(parts[0], winning_shape(parts[0], parts[1]))
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for line in data.splitlines()
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if (parts := line.split(maxsplit=1))
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]
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total = sum(scores)
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print(total)
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