mirror of
https://github.com/Crocmagnon/advent-of-code.git
synced 2024-11-24 15:38:10 +01:00
46 lines
1.3 KiB
Python
46 lines
1.3 KiB
Python
from math import prod
|
|
from typing import List
|
|
|
|
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)
|