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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long int ll;
  4.  
  5. int main() {
  6.    vector<int>arr={2,6,4,4,0};
  7. 	unordered_map<int,int>mp;
  8. 	int k;
  9. 	cin>>k;
  10. 	int count=0;
  11. 	int n=arr.size();
  12. 	mp[0]=1;
  13. 	int prefixsum=0;
  14. 	for(int i=0;i<n;i++)
  15. 	 {
  16. 	 	prefixsum=prefixsum+arr[i];
  17. 	 	if(mp.find(prefixsum-k)!=mp.end())
  18. 	 	 {
  19. 	 	 	count+=mp[prefixsum-k];
  20. 	 	 }
  21. 	 	 mp[prefixsum]++;
  22. 	 }
  23.  
  24. 	 cout<<count;
  25. }
  26.  
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/BDInGd
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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