class Solution {
public:
vector<vector<int>> flipAndInvertImage(vector<vector<int>>& A) {
int n = A.size();
for (int i = 0; i < n; i++)
{
int left = 0, right = n - 1;
while (left < right)
{
if (A[i][left] == A[i][right])
{
A[i][left] ^= 1;
A[i][right] ^= 1;
}
left++;
right--;
}
if (left == right)
{
A[i][left] ^= 1;
}
}
return A;
}
};