From 709ad10ae2e7d4af931185f091caadcb4131c128 Mon Sep 17 00:00:00 2001 From: Bruno BELANYI Date: Sat, 25 Dec 2021 16:55:18 +0100 Subject: [PATCH] 2021: d25: ex1: add solution --- 2021/d25/ex1/ex1.py | 89 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100755 2021/d25/ex1/ex1.py diff --git a/2021/d25/ex1/ex1.py b/2021/d25/ex1/ex1.py new file mode 100755 index 0000000..76fbe54 --- /dev/null +++ b/2021/d25/ex1/ex1.py @@ -0,0 +1,89 @@ +#!/usr/bin/env python + +import enum +import itertools +import sys +from typing import Iterable, Iterator, List, NamedTuple, Set + + +class Point(NamedTuple): + x: int + y: int + + +class Map(NamedTuple): + east: Set[Point] + south: Set[Point] + dimensions: Point + + +def solve(input: List[str]) -> int: + def parse() -> Map: + east, south = set(), set() + + for x, line in enumerate(input): + for y, c in enumerate(line): + if c == ".": + continue + if c == "v": + south.add(Point(x, y)) + if c == ">": + east.add(Point(x, y)) + + return Map(east, south, Point(len(input), len(input[0]))) + + def step(sea_cucumbers: Map) -> Map: + def move_east(p: Point) -> Point: + return Point(p.x, (p.y + 1) % sea_cucumbers.dimensions.y) + + def move_south(p: Point) -> Point: + return Point((p.x + 1) % sea_cucumbers.dimensions.x, p.y) + + east, south = set(), set() + + for old_p in sea_cucumbers.east: + p = move_east(old_p) + if p in sea_cucumbers.east or p in sea_cucumbers.south: + east.add(old_p) + continue + east.add(p) + + for old_p in sea_cucumbers.south: + p = move_south(old_p) + if p in east or p in sea_cucumbers.south: + south.add(old_p) + continue + south.add(p) + + return Map(east, south, sea_cucumbers.dimensions) + + def debug(map: Map) -> None: + for x in range(map.dimensions.x): + print( + "".join( + "v" + if Point(x, y) in map.south + else ">" + if Point(x, y) in map.east + else "." + for y in range(map.dimensions.y) + ) + ) + + sea_cucumbers = parse() + for i in itertools.count(1): + if (new_map := step(sea_cucumbers)) == sea_cucumbers: + return i + print(i) + sea_cucumbers = new_map + + assert False # Sanity check + + +def main() -> None: + input = [line.rstrip("\n") for line in sys.stdin.readlines()] + print(solve(input)) + + +if __name__ == "__main__": + main()