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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	// your code goes here
  6. 	int a[]={5,6,4,3,6};
  7. 	int n=sizeof(a)/sizeof(a[0]);
  8. 	int k=3;
  9. 	int count=0;
  10. 	int x=0;
  11. 	unordered_map<int,int>b;
  12. 	for(int i=0;i<n;i++){
  13. 		x=k+a[i];
  14. 		if(b.find(x)!=b.end()){
  15. 			count+=b[x];
  16.  
  17. 		}
  18. 		b[a[i]]++;
  19. 	}
  20. 	cout<<count;
  21.  
  22. 	return 0;
  23. }
Success #stdin #stdout 0s 5328KB
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https://ideone.com/QzbNhW
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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