func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize( O3 )   using namespace std;   const int N = 2e5 + 5;   int dist[N];   vector<int> open[N], close[N];   int n, k;   bool done[N];   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cin >> n >> k;     for (auto i = 0; i < (long long)(n); i++) {       int l, r;       cin >> l >> r;       open[l].push_back(i);       close[r + 1].push_back(i);       dist[i] = r + 1;     }     set<int> pool;     set<pair<int, int> > dist_idx;     vector<int> res;     for (auto i = 1; i < (long long)(N); i++) {       for (auto j : close[i]) {         if (done[j]) continue;         pool.erase(j);         dist_idx.erase({dist[j], j});       }       for (auto j : open[i]) {         pool.insert(j);         dist_idx.insert({dist[j], j});       }       while (((int)((pool).size())) > k) {         auto it = dist_idx.end();         it--;         int idx = (*it).second;         res.push_back(idx + 1);         dist_idx.erase(it);         pool.erase(idx);         done[idx] = true;       }     }     cout << ((int)((res).size())) <<   n ;     for (auto i : res) cout << i <<    ;     cout <<   n ;     return 0;   }   