[LeetCode] Rotate Image

public class Solution {
    public void rotate(int[][] matrix) {
        int n=matrix.length;
        for (int i=0; i<n/2; i++) {
            for (int j=i; j<n-1-i; j++) {
                int tmp = matrix[i][j];
                matrix[i][j] = matrix[n-1-j][i];
                matrix[n-1-j][i] = matrix[n-1-i][n-1-j];
                matrix[n-1-i][n-1-j] = matrix[j][n-1-i];
                matrix[j][n-1-i] = tmp;
            }
        }
    }
}