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?
// Source : https://oj.leetcode.com/problems/rotate-image/
// Author : Chao Zeng
// Date : 2014-12-25
class Solution {
public:
void rotate(vector<vector<int> > &matrix) {
int n = matrix.size();
vector<vector<int>>tmp(n,vector<int>(n));
for (int i = 0; i < n; i++){
for (int j = 0; j < n; j++){
tmp[i][j] = matrix[i][j];
}
}
for (int i = 0; i < n; i++){
for (int j = 0; j < n; j++){
matrix[j][n-1-i] = tmp[i][j];
}
}
}
};