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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int n;
  6.     cin >> n;
  7.  
  8.     vector<long long> a(n);
  9.  
  10.     for (int i = 0; i < n; i++) {
  11.         cin >> a[i];
  12.     }
  13.  long long k;
  14.  cin>>k;
  15.  
  16.  vector<long long> p(n);
  17.  p[0]=a[0];
  18.  for(int i=1;i<n;i++){
  19.  	p[i]=p[i-1]+a[i];
  20.  }
  21.  
  22.  int count =0;
  23.  
  24.  unordered_map<long long , long long> mp;
  25.  for(int j=0;j<n;j++){
  26.  	long long r = p[j]-k;
  27.  
  28.  	count+= mp[r];
  29.  
  30.  	mp[p[j]]++;
  31.  
  32.  }
  33.  cout<<count<<endl;
  34.  
  35.  
  36.     return 0;
  37. }
Success #stdin #stdout 0s 5320KB
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stdin
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10
2 2 3 5 2 2 3 2 2 1
8
stdout
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2
https://ideone.com/pnh3bI
language:
C++ (gcc 8.3)
created:
19 hours ago
visibility:
public

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