func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     vector<pair<long long int, long long int> > v;     long long int n, x, c = 0;     cin >> n;     for (int i = 0; i < n; i++) {       long long int a, b;       cin >> a >> b;       v.push_back(make_pair(a, b));     }     sort(v.begin(), v.end());     long long int i = 0;     x = v[0].second;     while (i < n) {       if (v[i].first <= x) i++;       if (v[i].second < x) x = v[i].second;       if (v[i].first > x || i >= n) {         c++;         x = v[i].second;       }     }     cout << c;   }   