func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     ;     long long int n;     cin >> n;     pair<long long int, long long int> a[n];     for (long long int i = 0; i < n; i++) cin >> a[i].first >> a[i].second;     sort(a, a + n);     long long int x1 = -1, y1 = -1, x2 = -1, y2 = -1;     for (long long int i = 0; i < n; i++) {       long long int x = a[i].first, y = a[i].second;       if (x > y1) {         x1 = x, y1 = y;         continue;       }       if (x > y2) {         x2 = x, y2 = y;         continue;       }       return cout <<  NO , 0;     }     cout <<  YES ;   }   