【2019秋冬】【LeetCode】289 生命游戏

class Solution {
public:
    void gameOfLife(vector<vector<int>>& board) 
    {
        for(int i=0;i<board.size();i++)
            for(int j=0;j<board[0].size();j++)
                nei(board,i,j);
        for(int i=0;i<board.size();i++)
            for(int j=0;j<board[0].size();j++)
            {
                if(board[i][j] == 2)
                    board[i][j] = 0;
                if(board[i][j] == -1)
                    board[i][j] = 1;
            }
        
    }
    void nei(vector<vector<int>>& board,int x,int y)
    {
        int live = 0;
        if(x>0)
        {
            if(board[x-1][y]>0)
                live++;
            if(y>0 && board[x-1][y-1]>0)
                live++;
            if(y<board[0].size()-1 && board[x-1][y+1]>0)
                live++; 
        }
        if(x<board.size()-1)
        {
            if(board[x+1][y]>0)
                live++;
            if(y>0 && board[x+1][y-1]>0)
                live++;
            if(y<board[0].size()-1 && board[x+1][y+1]>0)
                live++; 
        }
        if(y >0 && board[x][y-1]>0)
            live++;
        if(y < board[0].size()-1 && board[x][y+1]>0)
            live++;
        if(board[x][y] == 1)
        {
            if(live<2||live>3)
                board[x][y] = 2;
        }
        else if(live == 3)
            board[x][y] = -1;
    }

};

           

思路都会了，怎么代码死活越界，，，写的都没啥区别啊，服了

class Solution {
public:
    void gameOfLife(vector<vector<int>>& board) {
        int hang = board.size();
        int lie = board[0].size();
        for(int i=0; i<lie; i++){
            for(int j=0; j<hang; j++){
                int live = 0;
                if(i-1>=0){
                    if(j-1>=0) if(board[i-1][j-1]>0) live++;
                    if(j+1<hang) if(board[i-1][j+1]>0) live++;
                    if(board[i-1][j]>0) live++;                    
                }
                if(i+1<lie){
                    if(j-1>=0) if(board[i+1][j-1]>0) live++;
                    if(j+1<hang) if(board[i+1][j+1]>0) live++;
                    if(board[i+1][j]>0) live++;
                }
                if(j-1>=0) if(board[i][j-1]>0) live++;
                if(j+1<hang) if(board[i][j+1]>0) live++;
                if(board[i][j]==1){
                    if(live<2||live>3) board[i][j] = 2;
                }
                else if(live==3) board[i][j] = -1;           
            }
        }
    }
};