289. 生命游戏——数组

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class Solution {
public:void gameOfLife(vector<vector<int>>& board) {int rows = board.size(), columns = board[0].size();for(int row = 0; row < rows; ++row){for(int column = 0; column < columns; ++column){int live = 0;//检查周围8个for(int i = -1; i <= 1; ++i){for(int j = -1; j <= 1; ++j){//跳过自己if(i == 0 && j == 0)continue;int r = row + i;int c = column + j;//前面防止越界，后面判定该细胞存活则++if(r >=0 && r < rows && c >= 0 && c < columns && board[r][c] >= 1)++live;}}//曾经是活的，结果死了if(board[row][column] == 1 && (live <2 || live > 3))board[row][column] = 2;//回光返照状态//曾经是死的，结果活了if(board[row][column] == 0 && live == 3)board[row][column] = -1;//假死状态}}//然后让死的死，活的活for(int row = 0; row < rows; ++row){for(int column = 0; column < columns; ++column){if(board[row][column] == 0 || board[row][column] == 1)continue;if(board[row][column] == 2)board[row][column] = 0;else if(board[row][column] == -1)board[row][column] = 1;}}}
};

Accepted
22/22 cases passed (0 ms)
Your runtime beats 100 % of cpp submissions
Your memory usage beats 54.78 % of cpp submissions (6.7 MB)

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