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  1. #include<iostream>
  2. #include<vector>
  3. #include<stdio.h>
  4. using namespace std;
  5.  
  6.  
  7. vector<vector<int> > rotate(const vector<vector<int> > &v);
  8.  
  9. int main(){
  10.     vector<vector<int> > vec{{1,1,1},
  11.                              {2,2,2},
  12.                              {3,3,3}};
  13.  
  14.     // original
  15.  
  16.     for (int i = 0; i < vec.size(); i++) {
  17.         for (int j = 0; j < vec[0].size(); j++) {
  18.             cout << vec[i][j];
  19.         }
  20.         cout << "\n";
  21.     }
  22.  
  23.     cout << "after rotation:\n";
  24.     // print matrix after rotation
  25.     vector<vector<int> > ans = rotate(vec);
  26.     for (int i = 0; i < ans.size(); i++) {
  27.         for (int j = 0; j < ans[0].size(); j++) {
  28.             cout << ans[i][j];
  29.         }
  30.         cout << "\n";
  31.     }
  32.  
  33.     return 0;
  34. }
  35.  
  36. vector<vector<int> > rotate(const vector<vector<int> > &v) {
  37. 	int n = v.size();
  38.  
  39. 	// create nxn matrix
  40.     vector<vector<int> > ans(n, vector<int>(n));
  41.  
  42. 	// copy in the values rotated
  43.     for(int i = 0; i < n; i++) {
  44.         for(int j = 0; j < n; j++) {
  45.         	ans[i][j] = v[j][n - i - 1];
  46.         }
  47.     }
  48.  
  49.     return ans;
  50. }
Success #stdin #stdout 0s 15240KB
comments ()
stdin 
Standard input is empty
stdout 
111
222
333
after rotation:
123
123
123
https://ideone.com/jUm5uT
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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