func_code_string: #include <bits/stdc++.h>   using namespace std;   struct data {     int x;     int y;   };   int main() {     long long n;     cin >> n;     vector<data> info;     long long smallest = 9999999999;     long long largest2 = -1;     for (int i = 0; i < n; i++) {       data temp;       cin >> temp.x >> temp.y;       if (temp.y < smallest) {         smallest = temp.y;       }       if (temp.x > largest2) {         largest2 = temp.x;       }       info.push_back(temp);     }     long long m;     cin >> m;     vector<data> info2;     long long largest = -1;     long long smallest2 = 9999999999;     for (int i = 0; i < m; i++) {       data temp;       cin >> temp.x >> temp.y;       if (temp.x > largest) {         largest = temp.x;       }       if (temp.y < smallest2) {         smallest2 = temp.y;       }       info2.push_back(temp);     }     cout << max(max(largest - smallest, largest2 - smallest2), (long long)0)          << endl;     return 0;   }   