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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long int ll;
  4. int main(){
  5.     ll n,k;
  6.     cin>>n>>k;
  7.     ll a[n];
  8.     for(ll i=0;i<n;i++)cin>>a[i];
  9.     sort(a,a+n);
  10.     ll c=0,i=0;
  11.     for(int j=1;j<n;j++){
  12.         while(a[j]-a[i]>k)i++;
  13.         c+=j-i;
  14.     }
  15.     cout<<c<<endl;
  16.     return 0;
  17. }
  18.  
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin
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6 3
1 3 5 2 8 4
stdout
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10
https://ideone.com/9xnykv
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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