98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
# SPDX-License-Identifier: MIT
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# Copyright (c) 2021 Akumatic
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#
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# https://adventofcode.com/2021/day/11
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class Octopus:
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def __init__(self, idx, energy):
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self.idx = idx
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self._get_neighbor_idx()
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self.energy = energy
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self.flashed = False
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self.neighbors = list()
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def _get_neighbor_idx(self):
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if self.idx == 0: # top left corner
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self.neighbor_idx = [self.idx + i for i in (1, 10, 11)]
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elif self.idx == 9: # top right corner
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self.neighbor_idx = [self.idx + i for i in (-1, 9, 10)]
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elif self.idx == 90: # bottom left corner
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self.neighbor_idx = [self.idx + i for i in (-10, -9, 1)]
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elif self.idx == 99: # bottom right corner
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self.neighbor_idx = [self.idx + i for i in (-11, -10, -1)]
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elif self.idx < 10: # top edge
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self.neighbor_idx = [self.idx + i for i in (-1, 1, 9, 10, 11)]
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elif self.idx > 90: # bottom edge
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self.neighbor_idx = [self.idx + i for i in (-11, -10, -9, -1, 1)]
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elif self.idx % 10 == 0: # left edge
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self.neighbor_idx = [self.idx + i for i in (-10, -9, 1, 10, 11)]
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elif self.idx % 10 == 9: # right edge
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self.neighbor_idx = [self.idx + i for i in (-11, -10, -1, 9, 10)]
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else:
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self.neighbor_idx = [self.idx + i for i in (-11, -10, -9, -1, 1, 9, 10, 11)]
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def add_neighbor(self, neighbor):
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self.neighbors.append(neighbor)
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def flash(self):
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self.flashed = True
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for neighbor in self.neighbors:
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neighbor.energy += 1
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def read_file(filename: str = "input.txt") -> list:
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with open(f"{__file__.rstrip('code.py')}{filename}", "r") as f:
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lines = [line for line in f.read().strip().split("\n")]
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values = list()
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for line in lines:
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values += [int(x) for x in list(line)]
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return values
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def create_octopuses(vals: int) -> list:
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octopuses = [Octopus(i, vals[i]) for i in range(len(vals))]
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for octopus in octopuses:
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for i in octopus.neighbor_idx:
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octopus.add_neighbor(octopuses[i])
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return octopuses
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def step(octopuses: list) -> int:
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flashes = 0
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for octopus in octopuses:
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octopus.energy += 1
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repeat = True
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while repeat:
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repeat = False
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for octopus in octopuses:
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if octopus.energy > 9 and octopus.flashed == False:
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octopus.flash()
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flashes += 1
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repeat = True
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for octopus in octopuses:
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if octopus.flashed:
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octopus.flashed = False
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octopus.energy = 0
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return flashes
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def part1(vals: list) -> int:
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flashes = 0
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octopuses = create_octopuses(vals)
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for _ in range(100):
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flashes += step(octopuses)
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return flashes
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def part2(vals: list) -> int:
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octopuses = create_octopuses(vals)
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count = 0
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flashes = 0
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while flashes != 100:
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flashes = step(octopuses)
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count += 1
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return count
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if __name__ == "__main__":
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vals = read_file()
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print(f"Part 1: {part1(vals)}")
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print(f"Part 2: {part2(vals)}")
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