func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, x, y, i, j;     int l = 0, t = 0, m = 0, max = 0;     cin >> n;     cin >> i >> j;     l = j;     while (t < n) {       t++;       cin >> x >> y;       m = j - x + y;       if (m > max) {         max = m;       }       j = m;     }     if (max == 0 && l > 0 || l > max)       cout << l;     else       cout << max;     return 0;   }   