func_code_string: #include <bits/stdc++.h>   using namespace std;   struct time {     int s;     int e;   };   int main() {     int n;     cin >> n;     int s, e;     int minc = INT_MAX, maxc = -1;     for (int i = 0; i < n; i++) {       cin >> s >> e;       if (minc > e) {         minc = e;       }       if (maxc < s) {         maxc = s;       }     }     int m;     cin >> m;     int maxp = -1, minp = INT_MAX;     for (int i = 0; i < m; i++) {       cin >> s >> e;       if (minp > e) {         minp = e;       }       if (maxp < s) {         maxp = s;       }     }     int p = maxp - minc;     int q = maxc - minp;     if (p < 0 && q < 0) {       cout << 0;     } else {       cout << max(p, q);     }   }   