func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int n, c = 0;     cin >> n;     long long int d;     cin >> d;     long long int s[n + 5];     for (long long int i = 0; i < n; i++) {       cin >> s[i];     }     sort(s, s + n);     for (long long int i = 0; i < n - 1; i++) {       for (long long int j = i + 1; j < n; j++) {         if (s[j] - s[i] <= d) {           c++;         }       }     }     cout << c * 2 << endl;     return 0;   }   