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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int cs(vector<int>&arr,int k){
  4.     unordered_map<int,int>f;
  5.     int cnt=0,sum=0;
  6.     f[0]=1;
  7.     for(int i=0;i<arr.size();i++){
  8.         sum+=arr[i];
  9.         if(f.find(sum-k)!=f.end()) cnt+=f[sum-k];
  10.         f[sum]++;
  11.     }
  12.     return cnt;
  13. }
  14. int main(){
  15.     vector<int>arr={1,2,3,3,2};
  16.     cout<<cs(arr,5);
  17.     return 0;
  18. }
  19.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/cZKJIE
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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