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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #include <ext/pb_ds/assoc_container.hpp>
  4. #include <ext/pb_ds/tree_policy.hpp>
  5. using namespace __gnu_pbds;
  6. #define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
  7. #define FAST ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  8.  
  9.  
  10. signed  main(){
  11.     FAST
  12.     int n;
  13.     cin>>n;
  14.     vector<vector<int>>vec(4);
  15.     for(int i=0;i<n;i++){
  16.         int x;
  17.         cin>>x;
  18.         vec[x].push_back(i);
  19.     }
  20.     int mx=min({vec[1].size(),vec[2].size(),vec[3].size()});
  21.     cout<<mx<<'\n';
  22.  
  23.     for(int i=0;i<mx;i++){
  24.         cout<<vec[1][i]+1<<' '<<vec[2][i]+1<<' '<<vec[3][i]+1<<'\n';
  25.     }
  26.  
  27.  
  28.  
  29.  
  30.     return 0;
  31. }
  32.  
  33.  
Success #stdin #stdout 0.01s 5304KB
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https://ideone.com/cIOA9k
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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