You are given an n x n 2D matrix representing an image.
Rotate the image by 90 degrees (clockwise).
Follow up:
Could you do this in-place?
solution:找规律 int[i][]--int[][n-1-i]
public class Solution { public void rotate(int[][] matrix) { int n=matrix.length; 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]= matrix[i][j]; } } for(int i=0;i<n;i++){ for(int j=0;j<n;j++){ matrix[i][j]= temp[i][j]; } } } }
原文：http://www.cnblogs.com/joannacode/p/4416156.html