func_code_string: #include <bits/stdc++.h>   using namespace std;   pair<long long, long long> a[100100];   vector<long long> v, v2;   int main() {     int n, i;     cin >> n;     long long Answer = 0;     for (i = 0; i < n; i++) {       cin >> a[i].first >> a[i].second;       v.push_back(a[i].first);       v2.push_back(a[i].second);     }     sort(v.rbegin(), v.rend());     sort(v2.rbegin(), v2.rend());     for (i = 0; i < n; i++) {       Answer += max(v[i], v2[i]) + 1;     }     cout << Answer;     return 0;   }   