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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define nl '\n'
  5.  
  6. void fastio() {
  7.     std::ios_base::sync_with_stdio(false);
  8.     std::cin.tie(nullptr);
  9.     std::cout.tie(nullptr);
  10. }
  11.  
  12. void solve() {
  13.     int n; cin >> n;
  14.     vector<vector<int>>matrix(n+1,vector<int>(n+1));
  15.     vector<tuple<int,int,int>>ops;
  16.     for(int i =1;i<=n;i++){
  17.         for(int j = 1 ; j <= n ; j++){
  18.             matrix[i][j] =j;
  19.         }
  20.     }
  21.     for(int i = 1; i <= n; i++) {
  22.     	// two reverse from 1 to i then from i+1 to n
  23.         reverse(matrix[i].begin() + 1, matrix[i].begin() + i );         
  24.         reverse(matrix[i].begin() + i , matrix[i].begin() + 1 + n);     
  25.  
  26. 		//if i ==1 this will not affect 
  27.         if(i!=1) ops.push_back({i, 1, i});
  28.  
  29.         // as if i == n if we do i+1 this will be out of boundaires
  30.         if(i+1 <n) ops.push_back({i, i+1, n});
  31.     }
  32.  
  33.  
  34.     cout << ops.size() << nl;
  35.     for(auto i : ops){
  36.         cout << get<0>(i) << " " << get<1>(i) << " " << get<2>(i) << nl;
  37.     }
  38.  
  39. 	// just for testing 
  40.     // for(int i =1;i<=n;i++){
  41.     //     for(int j =1;j<=n;j++){
  42.     //         cout << matrix[i][j] << " ";
  43.     //     }
  44.     //     cout << nl;
  45.     // }
  46.  
  47.  
  48. }
  49.  
  50. int main() {
  51.     fastio();
  52.     int t = 1;
  53.     cin >> t;
  54.     while (t--)
  55.         solve();
  56.     return 0;
  57. }
  58.  
Success #stdin #stdout 0s 5336KB
comments (?)
stdin 
2 3 4
stdout 
3
1 2 3
2 1 2
3 1 3
5
1 2 4
2 1 2
2 3 4
3 1 3
4 1 4
https://ideone.com/SKnYg7
language:
C++ (gcc 8.3)
created:
14 days ago
visibility:
public

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