func_code_string: #include <bits/stdc++.h>   #pragma warning(disable : 4996)   using namespace std;   int n;   vector<set<int> > g(200000);   vector<int> used(200000);   int main() {     int n, m, k;     cin >> n >> m >> k;     vector<int> x(m);     vector<int> y(m);     for (int i = 0; i < m; i++) {       cin >> x[i] >> y[i];       x[i]--;       y[i]--;       g[x[i]].insert(y[i]);       g[y[i]].insert(x[i]);     }     set<pair<int, int> > s;     vector<int> v(n);     for (int i = 0; i < n; i++) {       s.insert(make_pair(g[i].size(), i));       v[i] = g[i].size();     }     while (s.size()) {       int a = s.begin()->first;       int b = s.begin()->second;       if (a < k) {         s.erase(make_pair(a, b));         v[b] = 0;         for (auto i = g[b].begin(); i != g[b].end(); i++)           if (v[*i] >= k) {             s.erase(make_pair(v[*i], *i));             v[*i]--;             s.insert(make_pair(v[*i], *i));           }       } else         break;     }     vector<int> ans(m);     ans[m - 1] = s.size();     for (int i = m - 1; i >= 1; i--) {       int fl = 0;       if (s.find(make_pair(v[x[i]], x[i])) != s.end()) fl++;       if (s.find(make_pair(v[y[i]], y[i])) != s.end()) fl++;       if (fl != 2)         ans[i - 1] = ans[i];       else {         s.erase(make_pair(v[x[i]], x[i]));         s.erase(make_pair(v[y[i]], y[i]));         v[x[i]]--;         v[y[i]]--;         s.insert(make_pair(v[x[i]], x[i]));         s.insert(make_pair(v[y[i]], y[i]));         g[x[i]].erase(y[i]);         g[y[i]].erase(x[i]);         while (s.size()) {           int a = s.begin()->first;           int b = s.begin()->second;           if (a < k) {             s.erase(make_pair(a, b));             v[b] = 0;             for (auto i = g[b].begin(); i != g[b].end(); i++)               if (v[*i] >= k) {                 s.erase(make_pair(v[*i], *i));                 v[*i]--;                 s.insert(make_pair(v[*i], *i));               }           } else             break;         }         ans[i - 1] = s.size();       }     }     for (int i = 0; i < m; i++) cout << ans[i] <<    ;     return 0;   }   