func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int num = 0;     int n;     cin >> n;     int d;     int sh[n];     cin >> d;     for (int i = 0; i < n; i++) cin >> sh[i];     for (int i = 0; i < n; i++) {       for (int k = i + 1; k < n; k++) {         if (abs(sh[i] - sh[k]) <= d) num += 2;       }     }     cout << num;   }   