# Case passed on my computer but got wrong answer?

• The case ["xxx", "xox", "xxx"] for this problem, my code get the answer ["xxx", "xxx", "xxx"] on my personal computer, but after I submit, I got wrong output. Anybody can help me and tell me why?

``````#include<iostream>
#include<vector>

using namespace std;

class Solution {
private:
int R;
int C;
public:
void solve(vector<vector<char> > &board)
{
if(board.size() == 0)
{
return ;
}
R = board.size();
C = board.begin()->size();
bool status = false;
for(int i = 0; i < R; ++i)
{
for(int k = 0; k < C; ++k)
{
if(board[i][k] == 'o')
{
status = true;
dfs(board, i, k, status);
}
}
}
for(int i = 0; i < R; ++i)
{
for(int k = 0; k < C; ++k)
{
if(board[i][k] == '?')
{
board[i][k] = 'o';
}
}
}
}
void dfs(vector<vector<char> > &board, int r, int c, bool &status)
{
board[r][c] = '?';
static const int dr[] = {1, -1, 0 , 0};
static const int dc[] = {0, 0, -1 , 1};
if(r == R - 1 || r == 0 || c == C - 1 || c == 0)
{
status = false;
}
for(int i = 0 ; i < 4; ++i)
{
int xr = r + dr[i];
int xc = c + dc[i];
if(xr < R and xr >= 0 and xc < C and xc >= 0 and board[xr][xc] == 'o')
{
dfs(board, xr, xc, status);
}
}
if(status)
{
board[r][c] = 'x';
}
}
};
/*
char *test_case[] = {
"xxxx",
"xoox",
"xxox",
"xoxx",
NULL
};
*/
char *test_case[] = {
"xxx",
"xox",
"xxx",
NULL
};
int main()
{
Solution slt;
int i = 0;
vector<vector<char> > board;
for(int i = 0; test_case[i]; ++i)
{
vector<char> v;
for(int k = 0 ; test_case[i][k] != 0; ++k)
{
v.push_back(test_case[i][k]);
}
board.push_back(v);
}
for(int i = 0 ; test_case[i]; ++i)
{
for(int k = 0 ; test_case[i][k] != 0; ++k)
{
cout << board[i][k];
}
cout << endl;
}
cout   << endl;
slt.solve(board);
for(int i = 0 ; test_case[i]; ++i)
{
for(int k = 0 ; test_case[i][k] != 0; ++k)
{
cout << board[i][k];
}
cout << endl;
}
}``````

• I have the same issue on the same test case, works on my own gnu g++ and compileonline.com, but not accepted here!

• Please note that the `x` is actually upper case `X`. Same with `o`, it should be uppercase `O`.

• Thanks， after i read the problem carefully again， i found it.

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