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#!/usr/bin/env python3
from itertools import chain, count, product
from libaoc import map2d, matrix, read_int_matrix
rows, cols = -1, -1
def flash(grid: matrix[int], i: int, j: int) -> int:
acc = 1
grid[i][j] = -1
for di, dj in ((-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1)):
ni = i + di
nj = j + dj
if 0 <= ni < rows and 0 <= nj < cols and grid[ni][nj] != -1:
grid[ni][nj] += 1
if grid[ni][nj] > 9:
acc += flash(grid, ni, nj)
return acc
def main() -> None:
global rows, cols
with open("input", "r", encoding="utf-8") as f:
grid = read_int_matrix(f)
rows = len(grid)
cols = len(grid[0])
acc = 0
# START PART 1
for _ in range(100):
# END PART 1 START PART 2
for step in count(1):
# END PART 2
grid = list(map2d(lambda n: n + 1, grid, list))
for i, j in product(range(rows), range(cols)):
if grid[i][j] > 9:
acc += flash(grid, i, j)
# START PART 2
if sum(chain.from_iterable(grid)) == -(rows * cols):
print(step)
return
# END PART 2
grid = list(map2d(lambda n: 0 if n == -1 else n, grid, list))
# START PART 1
print(acc)
# END PART 1
if __name__ == "__main__":
main()
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