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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int n,k,i,t=0,a[1000000];
  4. map<int,int>d;
  5. int main() {
  6.     cin>>n>>k;
  7.     for(i=0;i<n;i++)
  8.         cin>>a[i];
  9.     for(i=0;i<n;i++)
  10.        {t=t+d[a[i]-k];
  11.         d[a[i]]++;}
  12.     cout<<t;
  13.    return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5284KB
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stdin
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5 4
1
2
5
1
6
stdout
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2
https://ideone.com/TLBz1N
language:
C++ (gcc 8.3)
created:
278 days ago
visibility:
public

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