Could you help to take a look at my code

• I have got run time error with the very long test vector during submit. However, when I run it individually it is OK.
Here is my code:

``````class Solution {
public:
void travel(vector<vector<char>>& board, int x, int y, int nrow, int ncol) {
if(board[x][y]!='O') return;
board[x][y] = '1';
if(x-1>=0 && x-1<nrow) travel(board, x-1, y, nrow, ncol);
if(x+1>=0 && x+1<nrow) travel(board, x+1, y, nrow, ncol);
if(y-1>=0 && y-1<ncol) travel(board, x, y-1, nrow, ncol);
if(y+1>=0 && y+1<nrow) travel(board, x, y+1, nrow, ncol);
return;
}
void solve(vector<vector<char>>& board) {
int nrow = board.size(), ncol = (nrow>0)?board[0].size():0;
if(nrow<3 || ncol<3) return;
for(int x = 0; x<nrow; x++) {
travel(board, x, 0, nrow, ncol);
travel(board, x, ncol-1, nrow, ncol);
}
for(int y=1; y<ncol-1; y++) {
travel(board, 0, y, nrow, ncol);
travel(board, nrow-1, y, nrow, ncol);
}
for(int x=0; x<nrow;x++) {
for(int y=0; y<ncol; y++) {
if(board[x][y]=='1') board[x][y]='O';
else if(board[x][y]=='O') board[x][y]='X';
}
}
return;
}
};
``````

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