func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     long long d;     cin >> n >> d;     vector<long long> v;     long long x;     for (int i = 0; i < n; i++) {       cin >> x;       v.push_back(x);     }     int count = 0;     for (int i = 0; i < n; i++) {       for (int j = i + 1; j < n; j++) {         if (v[i] - v[j] >= 0 && v[i] - v[j] <= d)           count++;         else if (v[j] - v[i] >= 0 && v[j] - v[i] <= d)           count++;       }     }     cout << count * 2 << endl;     return 0;   }   