func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAX = 1e6 + 5;   struct T {     int l, r, i;     bool operator<(T const& other) {       return (l == other.l ? r < other.r : l < other.l);     }   };   int con[MAX][2];   pair<int, int> num[2 * MAX];   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int n, k, l, r;     cin >> n >> k;     for (int i = 0; i < n; i++) {       cin >> l >> r;       num[i * 2] = {l, 1};       num[i * 2 + 1] = {r, 2};     }     sort(num, num + 2 * n);     int c = 0, a = 0;     for (int i = 0; i < 2 * n; i++) {       bool go = true;       if (num[i].second == 1)         a++;       else         go = false, a--;       if (a == k && go) con[c][0] = num[i].first;       if (a == k - 1 && !go) con[c][1] = num[i].first, c++;     }     cout << c << endl;     for (int i = 0; i < c; i++) cout << con[i][0] <<     << con[i][1] << endl;   }   