38 lines
847 B
Python
38 lines
847 B
Python
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EX1 = [
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"cut 6",
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"deal with increment 7",
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"deal into new stack",
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]
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def main():
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with open("day22.txt") as input_file:
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lines = [l.rstrip() for l in input_file.readlines()]
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deck = list(range(10007))
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for line in lines:
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# Deal into new stack.
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if line.endswith("k"):
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deck.reverse()
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continue
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arg = int(line[line.rfind(" "):])
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# Deal with increment.
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if line[0] == "d":
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new_deck = [None] * len(deck)
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for i in range(len(deck)):
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new_deck[(i * arg) % len(new_deck)] = deck[i]
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deck = new_deck
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# Cut.
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elif line[0] == "c":
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cut, deck = deck[:arg], deck[arg:]
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deck += cut
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print(f"Position of card 2019: {deck.index(2019)}.")
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if __name__ == "__main__":
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main()
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