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[Leetcode] Rotate Image

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:

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

 

[Leetcode] Rotate Image