func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, sum = 0;     cin >> n;     int a[n][2], maxi = -100;     for (int i = 0; i < n; i++) {       for (int j = 0; j < 2; j++) {         cin >> a[i][j];       }     }     for (int i = 0; i < n; i++) {       for (int j = 0; j <= 0; j++) {         sum = sum - a[i][j];         sum = sum + a[i][j + 1];         maxi = max(maxi, sum);       }     }     cout << maxi;   }   