class Solution {
public:
    vector<vector<int> > rotateMatrix(vector<vector<int> > mat, int n) {
        // write code here
        int len = mat.size();
        vector<vector<int>> temp = mat;
        for (int i = 0; i < len; i++) {
            for (int j = 0; j < len; j++) {
                mat[j][n-1-i] = temp[i][j];
            }
        }
        return mat;
    }
};