func_code_string: #include <bits/stdc++.h>   using std::cin;   using std::cout;   using std::pair;   using std::set;   using std::sort;   using std::string;   using std::vector;   int main() {     int n, m;     cin >> n >> m;     vector<vector<pair<string, int>>> byreg(m);     for (int i = 0; i < n; i++) {       string a;       int b, c;       cin >> a >> b >> c;       byreg[b - 1].push_back(make_pair(a, c));     }     for (int i = 0; i < m; i++) {       sort(byreg[i].begin(), byreg[i].end(),            [](pair<string, int> &l, pair<string, int> &r) {              return l.second > r.second;            });     }     for (int i = 0; i < m; i++) {       if (byreg[i].size() > 2) {         if (byreg[i][0].second == byreg[i][2].second ||             byreg[i][1].second == byreg[i][2].second) {           cout <<  ? n ;         } else           cout << byreg[i][0].first <<     << byreg[i][1].first <<   n ;       } else         cout << byreg[i][0].first <<     << byreg[i][1].first <<   n ;     }     return 0;   }   