python-algorithms/aoc2021/day20part2.py at master · sagasu/python-algorithms · GitHub

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]

enhance = [char == "#" for char in lines[0]]

grid = [[char == "#" for char in row] for row in lines[2:]]

def step(grid):
    ng = []
    for row in grid:
        ng.append([0] * 10 + row + [0] * 10)
    for _ in range(10):
        ng.append([0] * (len(grid[0]) + 20))
        ng.insert(0, [0] * (len(grid[0]) + 20))
    ngc = [[0] * (len(ng[0]) - 2) for _ in range(len(ng) - 2)]
    for i in range(1, len(ng) - 1):
        for j in range(1, len(ng[i]) - 1):
            v = [ng[y][x] for y in [i - 1, i, i + 1] for x in [j - 1, j, j + 1]]
            d = int("".join(map(str, map(int, v))), 2)
            ngc[i - 1][j - 1] = enhance[d]
    return ngc

for _ in range(25):
    for _ in range(2):
        grid = step(grid)
    grid = grid[16:-16]
    grid = [row[16:-16] for row in grid]

print(sum(map(sum, grid)))