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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. const int M = 5005;
  4. const int M2 = 2500005;
  5. int n, a[M], so_uoc[M2];
  6. long long t[M], kq, d;
  7.  
  8.  
  9. int suoc(long long y)
  10. {
  11.     if(y <= M2)
  12.     {
  13.         if(so_uoc[y-1]) return so_uoc[y-1];
  14.     }
  15.     int dem = 0;
  16.     for(int i = 1; 1ll*i*i <= y; i++)
  17.     {
  18.         if(y%i == 0)
  19.         {
  20.             dem++;
  21.             if(i != y/i) dem++;
  22.         }
  23.     }
  24.     if(y <= M2) so_uoc[y-1] = dem;
  25.     return dem;
  26. }
  27.  
  28. int main()
  29. {
  30.     ios_base::sync_with_stdio(0);
  31.     cin.tie(0); cout.tie(0);
  32.     cin >> n;
  33.     for(int i = 1; i <= n; i++)
  34.     {
  35.         cin >> a[i];
  36.         t[i] = t[i-1] + a[i];
  37.     }
  38.     for(int v = 1; v < n; v++)
  39.     {
  40.         for(int w = v+1; w <= n; w++)
  41.         {
  42.             d = t[w] - t[v];
  43.             kq += 1ll * v * suoc(d);
  44.         }
  45.     }
  46.     cout << kq;
  47.     return 0;
  48. }
  49.  
Success #stdin #stdout 0s 5564KB
comments (?)
stdin 
4
250005
250005
250005
250005
stdout 
216
https://ideone.com/wY0bu3
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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