vector<vector<int>> flipAndInvertImage(vector<vector<int>>& A) {

int rows = (int) A.size();

int cols = (int) A[0].size();

for (int i = 0; i < rows; i++) {

int left = 0, right = cols - 1;

while (left <= right) {

swap(A[i][left], A[i][right]);

A[i][left] ^= 1;

if(left < right) {

A[i][right] ^= 1;

}

left++, right--;

}

}

return A;

}