func_code_string: #include <bits/stdc++.h>   using namespace std;   int main(int argc, char* argv[]) {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int n;     cin >> n;     int minr = 1e9 + 2;     int maxl = 0;     for (int i = 0; i < n; i++) {       int l, r;       cin >> l >> r;       if (l > maxl) {         maxl = l;       }       if (r < minr) {         minr = r;       }     }     int m;     cin >> m;     int minr2 = 1e9 + 2;     int maxl2 = 0;     for (int i = 0; i < m; i++) {       int l, r;       cin >> l >> r;       if (l > maxl2) {         maxl2 = l;       }       if (r < minr2) {         minr2 = r;       }     }     int diff1 = maxl - minr2;     int diff2 = maxl2 - minr;     int sol = max(max(diff1, diff2), 0);     cout << sol <<   n ;     return 0;   }   