Game of Life LeetCode solution in Python

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class Solution:
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    def gameOfLife(self, board: List[List[int]]) -> None:
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        r = len(board)
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        c = len(board[0])
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        ans = [[0] * c for _ in range(r)]
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        neighs = [[1, 0], [-1, 0], [0, 1], [0, -1], [-1, -1], [-1, 1], [1, 1], [1, -1]]
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        for i in range(r):
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            for j in range(c):
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                livecnt, deadcnt = 0, 0
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                for di, dj in neighs:
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                    if 0 <= (i + di) < r and 0 <= (j + dj) < c:
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                        if board[i + di][j + dj] == 0 or board[i + di][j + dj] == -1:
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                            deadcnt += 1
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                        else:
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                            livecnt += 1
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                if board[i][j] == 0:
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                    if livecnt == 3:
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                        board[i][j] = -1
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                else:
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                    if livecnt == 2 or livecnt == 3:
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                        board[i][j] = 1
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                    else:
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                        board[i][j] = -2
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        for i in range(r):
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            for j in range(c):
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                if board[i][j] == -1:
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                    board[i][j] = 1
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                elif board[i][j] == -2:
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                    board[i][j] = 0