func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long int t{};     cin >> t;     while (t--) {       long long int n{};       cin >> n;       long long int a[n];       for (long long int i = 0; i < n; i++) cin >> a[i];       bool visit[n];       memset(visit, 0, sizeof(visit));       vector<pair<long long int, long long int>> vec{};       for (long long int i = 0; i < n; i++) {         for (long long int j = 0; j < n; j++) {           if (i != j && a[i] != a[j] && (!visit[i] || !visit[j])) {             visit[i] = 1;             visit[j] = 1;             vec.push_back({i + 1, j + 1});           }         }       }       if (vec.size() == n - 1) {         cout <<  YES  <<   n ;         for (long long int i = 0; i < n - 1; i++) {           cout << vec[i].first <<     << vec[i].second <<   n ;         }       } else {         cout <<  NO  <<   n ;       }     }     return 0;   }   