func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     ;     long long int n;     cin >> n;     vector<long long int> a, d;     for (long long int i = 0; i < n; i++) {       long long int temp;       cin >> temp;       a.push_back(temp);     }     for (long long int i = 0; i < n; i++) {       long long int temp;       cin >> temp;       d.push_back(a[i] - temp);     }     sort(d.begin(), d.end());     long long int i = 0, j = n - 1, s = 0;     while (i != j) {       if (d[i] + d[j] > 0) {         j--;       } else {         i++;         s += n - j - 1;       }     }     s += (n - j - 1) * (n - j) / 2;     cout << s << endl;     return 0;   }   