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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.   int n,k;
  7.   cin>>k>>n;
  8.   vector<int> arr(n);
  9. unordered_map<int,int> mp;// <sum,freq of sum>
  10.   cin>>arr[0];
  11.  
  12.   for(int i=1;i<n;i++)
  13.   {
  14.       cin>>arr[i];
  15.  
  16.   }
  17.   int x=0;
  18.   int count=0;
  19.   int sum =0;
  20.   mp[0]=1;    // very important
  21. for(int j=0;j<n;j++)
  22. {
  23.     sum=sum+arr[j];
  24.     count+= mp[sum-k];
  25.     mp[sum]++;
  26. }
  27.   cout<<count;
  28.  
  29.     return 0;
  30. }
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/SZ9Ix1
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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