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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef long long ll;
  5.  
  6. int main() {
  7.     ll n, k;
  8.     cin >> n >> k;
  9.  
  10.     vector<ll> a(n);
  11.  
  12.     for(ll i = 0; i < n; i++)
  13.         cin >> a[i];
  14.  
  15.     sort(a.begin(), a.end());
  16.  
  17.     ll l = 0;
  18.     ll ans = 0;
  19.  
  20.     for(ll r = 0; r < n; r++) {
  21.         while(a[r] - a[l] > k)
  22.             l++;
  23.  
  24.         ans += r - l;
  25.     }
  26.  
  27.     cout << ans << '\n';
  28.  
  29.     return 0;
  30. }
Success #stdin #stdout 0.01s 5276KB
comments (?)
stdin 
4 10
1 2 3 4
stdout 
6
https://ideone.com/KkyDWw
part 4
language:
C++ (gcc 8.3)
created:
15 days ago
visibility:
public

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