Solution.cpp

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