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day6 - slow-ish

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Stefan Harmuth 2024-12-06 07:06:23 +01:00
parent 5796d65b3d
commit c199f402e2
3 changed files with 209 additions and 0 deletions
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from tools.aoc import AOCDay
from typing import Any
from tools.coordinate import Coordinate
from tools.grid import Grid
DIRECTIONS = [(0, -1), (1, 0), (0, 1), (-1, 0)]
def walk_room(grid: Grid, start: Coordinate) -> tuple[set, bool]:
cur_pos = start
dir_index = 0
visited = set()
while grid.isWithinBoundaries(cur_pos):
if (cur_pos, dir_index) in visited:
return set(x[0] for x in visited), True
visited.add((cur_pos, dir_index))
next_pos = cur_pos + DIRECTIONS[dir_index]
while grid.get(next_pos):
dir_index = (dir_index + 1) % len(DIRECTIONS)
next_pos = cur_pos + DIRECTIONS[dir_index]
cur_pos = next_pos
return visited, False
class Day(AOCDay):
inputs = [
[
(41, "input6_test"),
(5208, "input6"),
],
[
(6, "input6_test"),
(1972, "input6"),
],
]
def parse_input(self) -> tuple[Grid, Coordinate]:
grid = Grid.from_data(self.getInput(), translate={".": False, "#": True})
start = list(grid.find("^"))[0]
grid.set(start, False)
return grid, start
def part1(self) -> Any:
grid, cur_pos = self.parse_input()
return len(set(x[0] for x in walk_room(grid, cur_pos)[0]))
def part2(self) -> Any:
grid, start = self.parse_input()
visits = set(x[0] for x in walk_room(grid, start)[0])
loops = 0
for obs_pos in visits:
if obs_pos == start:
continue
grid.set(obs_pos, True)
loops += walk_room(grid, start)[1]
grid.set(obs_pos, False)
return loops
if __name__ == "__main__":
day = Day(2024, 6)
day.run(verbose=True)

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