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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?
C++实现代码:
#include<iostream>#include<vector>using namespace std;class Solution{public: void rotate(vector<vector<int> > &matrix) { if(matrix.empty()) return; vector<vector<int> > temp=matrix; int i,j; int n=matrix.size(); for(i=0;i<n;i++) { for(j=0;j<n;j++) { matrix[j][n-i-1]=temp[i][j]; } } }};int main(){ Solution s; vector<vector<int> > vec={{1,2,3},{4,5,6},{7,8,9}}; s.rotate(vec); for(auto a:vec) { for(auto v:a) cout<<v<<" "; cout<<endl; }}
Rotate Image
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