func_code_string: #include <bits/stdc++.h>   using namespace std;   int N, K;   int tosum;   int begin1 = 1000000001, end1;   map<int, pair<int, int> > m;   vector<pair<int, int> > v;   int main() {     if (fopen( cf612d.in ,  r )) {       freopen( cf612d.in ,  r , stdin);       freopen( cf612d.out ,  w , stdout);     }     scanf( %d %d , &N, &K);     for (int i = 0; i < N; i++) {       int a, b;       scanf( %d %d , &a, &b);       m[a].first++;       m[b].second++;     }     for (map<int, pair<int, int> >::iterator it = m.begin(); it != m.end();          it++) {       tosum += it->second.first;       if (tosum >= K && begin1 == 1000000001) {         begin1 = it->first;       }       tosum -= it->second.second;       if (tosum < K && begin1 != 1000000001) {         end1 = it->first;         v.push_back(make_pair(begin1, end1));         begin1 = 1000000001;       }     }     printf( %u n , v.size());     for (int i = 0; i < v.size(); i++) {       printf( %d %d n , v[i].first, v[i].second);     }     return 0;   }   