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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. map<int,int> mp;
  4. int n,k,arr[1000100];
  5. int main() 
  6. {
  7. 	int ans=0;
  8. 	cin>>n>>k;
  9. 	for(int i=0;i<n;i++)
  10. 	{
  11. 		cin>>arr[i];
  12. 		mp[arr[i]]++;
  13. 	}
  14. 	for(int i=0;i<n;i++)
  15. 	{
  16. 		ans+=mp[arr[i]+k];
  17. 	}
  18. 	cout<<ans<<endl;
  19. 	// your code goes here
  20. 	return 0;
  21. }
Success #stdin #stdout 0s 19968KB
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5 2
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stdout
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https://ideone.com/tPo0Db
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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