76 lines
1.7 KiB
Python
76 lines
1.7 KiB
Python
import fileinput
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import itertools
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from pprint import pprint
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from typing import Any, Dict, List, Optional, Tuple
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def parse() -> List[int]:
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line = next(fileinput.input()).strip()
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return [int(cup) for cup in line]
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def step(cups: Dict[int, int], current_label: int, min_, max_) -> int:
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a = cups[current_label]
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b = cups[a]
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c = cups[b]
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picked_up: List[int] = [a, b, c]
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cups[current_label] = cups[c]
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destination = current_label - 1
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if destination < min_:
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destination = max_
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while destination in picked_up:
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destination -= 1
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if destination < min_:
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destination = max_
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cups[picked_up[2]] = cups[destination]
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cups[destination] = picked_up[0]
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return cups[current_label]
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def part1(labels):
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cups = [None] * (len(labels) + 1)
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for i in range(len(labels)):
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cups[labels[i]] = labels[(i + 1) % len(labels)]
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current = labels[0]
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min_ = min(labels)
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max_ = max(labels)
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for _ in range(100):
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current = step(cups, current, min_, max_)
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label = 1
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print("Part 1: ", end="")
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for _ in range(8):
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label = cups[label]
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print(label, end="")
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print()
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def part2(labels):
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labels = labels + [i for i in range(max(labels) + 1, 1_000_001)]
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cups = [0] * (len(labels) + 1)
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for i in range(len(labels)):
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cups[labels[i]] = labels[(i + 1) % len(labels)]
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current = labels[0]
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min_ = min(labels)
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max_ = max(labels)
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for turn in range(10_000_000):
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current = step(cups, current, min_, max_)
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a = cups[1]
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b = cups[a]
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print("Part 2:", a * b)
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def main() -> None:
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labels = parse()
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part1(labels)
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part2(labels)
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if __name__ == "__main__":
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main()
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