leetcode[48]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?
class Solution { public: void rotate(vector<vector<int> > &matrix) { int n=matrix.size(); for (int i=0;i<n/2;i++) { for (int j=i;j<n-1-i;j++) { int temp=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]=temp; } } return; } };