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Solve day 3

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Gabriel Augendre 2020-12-03 08:48:43 +01:00
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2020/day03-toboggan.py Normal file
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from collections import Counter
from math import prod
from typing import List, Tuple
TREE = "#"
def main(filename: str, expected_part_1: int = None, expected_part_2: int = None):
print(f"\n+ Running on {filename}")
with open(filename) as f:
forest = f.read().strip().split("\n") # type: List[str]
trees_31 = trees_for_slope(forest, right=3, down=1)
print(f"Found {trees_31} trees for part 1")
if expected_part_1:
assert trees_31 == expected_part_1
trees = [
trees_31,
trees_for_slope(forest, right=1, down=1),
trees_for_slope(forest, right=5, down=1),
trees_for_slope(forest, right=7, down=1),
trees_for_slope(forest, right=1, down=2),
]
print(f"Found these trees for part 2: {trees}")
prod_trees = prod(trees)
print(f"Found {prod_trees} trees for part 2")
if expected_part_2:
assert prod_trees == expected_part_2
def trees_for_slope(forest: List[str], right: int, down: int) -> int:
trees = 0
current_line = 0
current_col = 0
while current_line < len(forest):
item = forest[current_line][current_col]
if item == TREE:
trees += 1
current_col = (current_col + right) % len(forest[0])
current_line += down
return trees
if __name__ == "__main__":
main("inputs/day03-tests", 7, 336)
main("inputs/day03", 240, 2832009600)

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