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) { // Start typing your C/C++ solution below // DO NOT write int main() function int n=matrix.size(); int half=n/2; for(int i=0;i<half;i++){ for(int j=0;j<half;j++){ int temp; 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; } } if(n%2==1){ int i=half; for(int j=0;j<half;j++){ int temp; 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; } } } };