题解 | #顺时针旋转矩阵#

public static int[][] rotateMatrix(int[][] mat, int n) {
        int[][] ans = new int[n][n];
        // write code here
        for(int j=0; j<n; j++){
            for (int i=n-1; i>=0; i--){
                ans[j][n-i-1]=mat[i][j];
            }
        }
        return ans;
    }