game_of_life.py

class Solution(object):
    def gameOfLife(self, board):
        """
        :type board: List[List[int]]
        :rtype: void Do not return anything, modify board in-place instead.
        """
        answer = copy.deepcopy(board)
        row = len(board)
        col = len(board[0])
        
        def check_rule(cur, live):
            return (cur == 1 and live == 2) or (cur == 1 and live == 3) or (cur == 0 and live == 3)
        
        def is_not_at_border(m, n):
            return (m >= 0) and (n >= 0) and (m < row) and (n < col)
            
        def check_neighbors(m, n):
            live = 0 - answer[m][n] # remove self live or dead
            for i in range(-1, 2):
                for j in range(-1, 2):
                    if (is_not_at_border(m+i, n+j) and answer[m+i][n+j] == 1):
                        live += 1
            # print(m, n, live)
            return int(check_rule(answer[m][n], live))
        
        for i in range(0, row):
            for j in range(0, col):
                board[i][j] = check_neighbors(i, j)