func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     int up, down;     int people = 0;     int max = 0;     cin >> n;     while (n--) {       cin >> up >> down;       people = people - up + down;       if (people > max) max = people;     }     cout << max << endl;     return 0;   }   