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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. long long n, h, contadivisori;
  5.  
  6. void contadiv(long long  x) {
  7.     contadivisori = 0;
  8.     long long  y = 1;
  9.     h = 1;
  10.     while (y <= static_cast<int64_t>(std::trunc(std::sqrt(x)))) {
  11.         if (x % y == 0) {
  12.             if (y != x / y) 
  13.                 h += 2;
  14.             else 
  15.                 h += 1;
  16.         }
  17.         y++;
  18.     }
  19.     contadivisori = h - 1;  
  20. }
  21.  
  22. long long  compute(long long  x) { 
  23.     long long  i, somma = 0;
  24.     for (i = 1; i <= n; i++) {
  25.         contadiv(i);
  26.         somma += contadivisori;
  27.     }
  28.     return somma;
  29. }
  30.  
  31. int main() {
  32.     std::cin >> n;
  33.     std::cout << compute(n) << std::endl;
  34.     return 0;
  35. }
Success #stdin #stdout 0.01s 5312KB
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https://ideone.com/mJnTrE
language:
C++ (gcc 8.3)
created:
17 hours ago
visibility:
public

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