52 lines
1.2 KiB
Python
52 lines
1.2 KiB
Python
def parse_data() -> list[int]:
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numbers = []
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with open("input.txt") as file:
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for line in file:
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numbers += map(int, line.split(","))
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return numbers
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def solve(data: list[int], which_number: int) -> int:
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turns = {}
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curr_turn = 1
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last_num = 0
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def shift(_number, _turn) -> None:
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if _number in turns:
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(_turn_before, _turn_last) = turns[_number]
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turns[_number] = (_turn_last, _turn)
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else:
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turns[_number] = (-1, _turn)
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for number in data:
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turns[number] = (-1, curr_turn)
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last_num = number
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curr_turn += 1
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_limit = which_number + 1
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for i in range(curr_turn, _limit):
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if last_num in turns:
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(before, last) = turns[last_num]
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if before != -1:
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age = last - before
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last_num = age
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shift(age, i)
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continue
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last_num = 0
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shift(0, i)
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return last_num
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def solve_p1(data: list[int]) -> int:
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return solve(data, which_number=2020)
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def solve_p2(data: list[int]) -> int:
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return solve(data, which_number=30000000)
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DATA = parse_data()
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print(solve_p1(DATA))
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print(solve_p2(DATA))
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