func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int n;     cin >> n;     long long int arr[n][2];     for (int i = 0; i < n; i++) {       cin >> arr[i][0] >> arr[i][1];     }     long long int x = max(arr[0][0], arr[0][1]);     vector<int> v1;     int fail = 0;     for (int i = 1; i < n; i++) {       long long int y = max(arr[i][0], arr[i][1]);       long long int k = min(arr[i][0], arr[i][1]);       if (y <= x) {         v1.push_back(y);         x = y;       } else if (k <= x) {         v1.push_back(k);         x = k;       } else {         fail = 1;         break;       }     }     if (fail == 1)       cout <<  NO ;     else       cout <<  YES ;     return 0;   }   