public class Solution {
    public int[][] rotateMatrix(int[][] mat, int n) {
        // write code here
        //mat[i][j]旋转到mat[j][n-i-1]的位置
        int[][] temp = new int[n][n];
        for(int i = 0;i<n;i++){
            for(int j = 0;j< n;j++){
                temp[j][n-1-i] = mat[i][j];
            }
        }
        return temp;
    }
}