func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, k, l, r[200005], cnt = 0;     bool valid[200005];     pair<int, int> p;     pair<int, pair<int, int> > u;     vector<int> v;     vector<pair<int, pair<int, int> > > event;     priority_queue<pair<int, int> > pq;     scanf( %d %d , &n, &k);     for (int i = 1; i <= n; i++) {       scanf( %d %d , &l, &r[i]);       event.push_back(make_pair(l, make_pair(0, i)));       event.push_back(make_pair(r[i] + 1, make_pair(1, i)));     }     sort(event.begin(), event.end());     memset(valid, true, sizeof valid);     for (int i = 0; i < (int)event.size(); i++) {       u = event[i];       l = u.first;       while (u.first == l) {         if (u.second.first == 0) {           pq.push(make_pair(r[u.second.second], u.second.second));           cnt++;         } else if (valid[u.second.second]) {           valid[u.second.second] = false;           cnt--;         }         i++;         if (i == (int)event.size()) break;         u = event[i];       }       i--;       while (cnt > k) {         p = pq.top();         pq.pop();         while (!valid[p.second]) {           p = pq.top();           pq.pop();         }         valid[p.second] = false;         v.push_back(p.second);         cnt--;       }     }     printf( %d n , (int)v.size());     for (int i = 0; i < (int)v.size(); i++) {       if (i) putchar(   );       printf( %d , v[i]);     }     puts(  );     return 0;   }   