func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     pair<int, int> a[105];     for (int i = 0; i < n; i++) {       cin >> a[i].first;       a[i].second = i + 1;     }     sort(a, a + n);     for (int i = 0; i < n / 2; i++)       cout << a[i].second <<     << a[n - i - 1].second << endl;     return 0;   }   