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Solve day 3
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parent
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3 changed files with 381 additions and 0 deletions
47
2020/day03-toboggan.py
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47
2020/day03-toboggan.py
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from collections import Counter
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from math import prod
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from typing import List, Tuple
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TREE = "#"
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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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forest = f.read().strip().split("\n") # type: List[str]
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trees_31 = trees_for_slope(forest, right=3, down=1)
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print(f"Found {trees_31} trees for part 1")
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if expected_part_1:
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assert trees_31 == expected_part_1
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trees = [
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trees_31,
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trees_for_slope(forest, right=1, down=1),
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trees_for_slope(forest, right=5, down=1),
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trees_for_slope(forest, right=7, down=1),
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trees_for_slope(forest, right=1, down=2),
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]
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print(f"Found these trees for part 2: {trees}")
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prod_trees = prod(trees)
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print(f"Found {prod_trees} trees for part 2")
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if expected_part_2:
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assert prod_trees == expected_part_2
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def trees_for_slope(forest: List[str], right: int, down: int) -> int:
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trees = 0
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current_line = 0
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current_col = 0
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while current_line < len(forest):
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item = forest[current_line][current_col]
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if item == TREE:
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trees += 1
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current_col = (current_col + right) % len(forest[0])
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current_line += down
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return trees
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if __name__ == "__main__":
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main("inputs/day03-tests", 7, 336)
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main("inputs/day03", 240, 2832009600)
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323
2020/inputs/day03
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2020/inputs/day03
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11
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