fork download
copy 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n,k; cin >> n >> k;
  6. 	vector<int> arr(n);
  7. 	for(int i = 0; i < n; i++)
  8. 	cin >> arr[i];
  9.  
  10. 	unordered_map<int,int> mp;
  11. 	int cnt = 0;
  12. 	for(int i = 0; i < n; i++){
  13. 		mp[arr[i]]++;
  14. 	}
  15. 	for(auto it : mp){
  16. 		int val = it.first;
  17. 		int req = val - k;
  18. 		if(mp.find(req) != mp.end())
  19. 		cnt++;
  20. 	}
  21. 	cout << cnt;
  22. 	return 0;
  23. }
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin
copy 
5 0
1 2 2 2 3
stdout
copy 
3
https://ideone.com/fj2pST
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!