[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; } } } }