func_code_string: #include <bits/stdc++.h>   using namespace std;   bool a[18][18];   int main() {     int n, m;     cin >> n >> m;     for (int i = 0; i < n; i++) {       for (int j = 0; j < n; j++) a[i][j] = 1;     }     map<string, int> mp;     string name;     vector<string> names(n);     for (int i = 0; i < n; i++) {       cin >> name;       mp[name] = i;       names[i] = name;     }     string s1, s2;     for (int i = 0; i < m; i++) {       cin >> s1 >> s2;       a[mp[s1]][mp[s2]] = 0;       a[mp[s2]][mp[s1]] = 0;     }     int res = 0;     vector<int> v;     vector<int> vres;     for (int i = 1; i < (1 << n); i++) {       v.clear();       for (int j = 0; j < n; j++) {         if ((1 << j) & i) {           v.push_back(j);         }       }       bool b = true;       for (int j = 0; j < v.size(); j++) {         for (int k = j + 1; k < v.size(); k++) {           if (!a[v[j]][v[k]]) {             b = false;             break;           }         }       }       if (b) {         if (v.size() > res) {           res = v.size();           vres = v;         }       }     }     cout << res << endl;     vector<string> team;     for (int i = 0; i < vres.size(); i++) {       team.push_back(names[vres[i]]);     }     sort(team.begin(), team.end());     for (int i = 0; i < team.size(); i++) {       if (i != 0) cout << endl;       cout << team[i];     }     cout << endl;     return 0;   }   