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Merge pull request #166 from GriceTurrble/feat/2024-day6
Feat/2024-day6
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‎2024/inputs/day06.txt‎

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‎2024/inputs/tests/test_day06.txt‎

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....#.....
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.........#
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..........
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..#.......
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.......#..
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..........
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.#..^.....
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........#.
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#.........
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......#...

‎2024/python/src/grice_py_aoc_2024/day06/main.py‎

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from __future__ import annotations
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import time
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from collections import deque
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from pathlib import Path
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from typing import TypeVar
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DIR = Path(__file__).parent
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FILE = DIR.parents[3] / "inputs" / f"{DIR.stem}.txt"
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directions = deque(["up", "right", "down", "left"])
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10-
def part1(contents: str):
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return "Not done yet!"
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GUARD = "^"
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def _find_guard(grid: list[str]) -> tuple[int, int]:
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for x, line in enumerate(grid):
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if GUARD in line:
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return (x, line.index(GUARD))
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raise ValueError("Did not find the guard!")
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T = TypeVar("T")
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def _new_direction(directions: deque[T]) -> T:
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"""Returns the direction at index 0.
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Directions is mutated by this function: it is rotated,
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moving the first direction to the end of the sequence.
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"""
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direction = directions[0]
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directions.rotate(-1)
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return direction
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def part1(grid: list[str]) -> int:
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guard = _find_guard(grid=grid)
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len_col, len_row = len(grid), len(grid[0])
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directions = deque(
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[
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(-1, 0), # up
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(0, 1), # right
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(1, 0), # down
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(0, -1), # left
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],
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)
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# Get the starting direction.
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direction = _new_direction(directions)
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# Gather set of all coordinates we've seen
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visited = set()
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visited.add(guard)
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while True:
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next_space = (guard[0] + direction[0], guard[1] + direction[1])
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nx, ny = next_space
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if not (0 <= nx < len_col) or not (0 <= ny < len_row):
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# The next space is outside the walls; the guard leaves the area
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break
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if grid[nx][ny] == "#":
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# Guard hits an obstacle.
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# Does not move, but changes direction for next time.
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direction = _new_direction(directions)
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else:
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# The guard moves into the new space.
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guard = (nx, ny)
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# Add this position to visited spaces
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visited.add(guard)
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return len(visited)
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def part2(contents: str):
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def part2(grid: list[str]):
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# TODO
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return "Not done yet!"
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def main():
19-
contents = FILE.read_text()
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grid = FILE.read_text().strip().split("\n")
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_start1 = time.perf_counter()
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result1 = part1(contents)
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result1 = part1(grid=grid)
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_delta1 = time.perf_counter() - _start1
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print(f">> Part 1: {result1} ({_delta1:.6f}s)")
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_start2 = time.perf_counter()
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result2 = part2(contents)
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result2 = part2(grid=grid)
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_delta2 = time.perf_counter() - _start2
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print(f">> Part 2: {result2} ({_delta2:.6f}s)")
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