fork download
copy 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. int main()
  5. {
  6.     int n;
  7.     cin >> n;
  8.     vector<int> arr1, arr2, arr3;
  9.     for (int i = 1; i <= n; i++){
  10.         int a; cin >> a;
  11.         if (a == 1) arr1.push_back(i);
  12.         else if (a == 2) arr2.push_back(i);
  13.         else arr3.push_back(i);
  14.     }
  15.     int mx = min({arr1.size(), arr2.size(), arr3.size()});
  16.     cout << mx << endl;
  17.     for (int i = 0; i < mx; i++){
  18.         cout << arr1[i] << ' ' << arr2[i] << ' ' << arr3[i] << endl;
  19.     }
  20. }
  21.  
Success #stdin #stdout 0s 5272KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
0
https://ideone.com/IQ9KHy
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!