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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int counting(vector<int>&summ,int n,int k){
  4. 	unordered_map<int,int>a;
  5. 	int sum=0;
  6. 	int count=0;
  7. 	for(int i=0;i<n;i++){
  8. 		sum+=summ[i];
  9. 		if(sum==k){
  10. 			count++;
  11. 		}
  12. 		int x=sum-k;
  13. 		if(a.find(x)!=a.end()){
  14. 			count+=a[x];
  15. 		}
  16. 		a[sum]=i;
  17. 	}
  18.  
  19. 	return count;
  20. }
  21.  
  22. int main() {
  23. 	// your code goes here
  24. 	vector<int>summ={1,2,3,6,5};
  25. 	int k=5;
  26. 	int n=summ.size();
  27. 	int ans=counting(summ,n,k);
  28. 	cout<<ans;
  29. 	return 0;
  30. }
Success #stdin #stdout 0.01s 5280KB
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https://ideone.com/2tueI2
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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