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Solve day 6
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56
2021/day06_lanternfish.py
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56
2021/day06_lanternfish.py
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from collections import defaultdict
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from concurrent.futures import ThreadPoolExecutor, as_completed
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from typing import Dict, Iterator, List
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def main(filename: str, expected_part_1: int = None, expected_part_2: int = None):
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print(f"\n+ Running on {filename}")
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with open(filename) as f:
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data = f.read().strip().split("\n")
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data = parse_data(data)
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solution_part_1 = solve_part_1(data)
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print(f"1. Found {solution_part_1}")
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if expected_part_1:
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assert expected_part_1 == solution_part_1
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solution_part_2 = solve_part_2(data)
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print(f"2. Found {solution_part_2}")
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if expected_part_2:
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assert expected_part_2 == solution_part_2
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def parse_data(data: List[str]) -> Dict[int, int]:
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dct = defaultdict(int)
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for x in map(int, data[0].split(",")):
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dct[x] += 1
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return dct
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def solve_part_1(data) -> int:
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for _ in range(80):
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data = _run_day(data)
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return sum(data.values())
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def _run_day(data: Dict[int, int]) -> Dict[int, int]:
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new_data = defaultdict(int)
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for k, v in data.items():
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if k == 0:
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new_data[6] += v
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new_data[8] += v
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else:
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new_data[k - 1] += v
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return new_data
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def solve_part_2(data) -> int:
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for _ in range(256):
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data = _run_day(data)
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return sum(data.values())
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if __name__ == "__main__":
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main("inputs/day06-test1", expected_part_1=5934, expected_part_2=26984457539)
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main("inputs/day06", expected_part_1=345793)
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1
2021/inputs/day06
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1
2021/inputs/day06
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3,1,5,4,4,4,5,3,4,4,1,4,2,3,1,3,3,2,3,2,5,1,1,4,4,3,2,4,2,4,1,5,3,3,2,2,2,5,5,1,3,4,5,1,5,5,1,1,1,4,3,2,3,3,3,4,4,4,5,5,1,3,3,5,4,5,5,5,1,1,2,4,3,4,5,4,5,2,2,3,5,2,1,2,4,3,5,1,3,1,4,4,1,3,2,3,2,4,5,2,4,1,4,3,1,3,1,5,1,3,5,4,3,1,5,3,3,5,4,2,3,4,1,2,1,1,4,4,4,3,1,1,1,1,1,4,2,5,1,1,2,1,5,3,4,1,5,4,1,3,3,1,4,4,5,3,1,1,3,3,3,1,1,5,4,2,5,1,1,5,5,1,4,2,2,5,3,1,1,3,3,5,3,3,2,4,3,2,5,2,5,4,5,4,3,2,4,3,5,1,2,2,4,3,1,5,5,1,3,1,3,2,2,4,5,4,2,3,2,3,4,1,3,4,2,5,4,4,2,2,1,4,1,5,1,5,4,3,3,3,3,3,5,2,1,5,5,3,5,2,1,1,4,2,2,5,1,4,3,3,4,4,2,3,2,1,3,1,5,2,1,5,1,3,1,4,2,4,5,1,4,5,5,3,5,1,5,4,1,3,4,1,1,4,5,5,2,1,3,3
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1
2021/inputs/day06-test1
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1
2021/inputs/day06-test1
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3,4,3,1,2
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