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  1. #include <iostream>
  2. #include <set>
  3. #include <string>
  4. #include <cmath>
  5.  
  6. using namespace std;
  7.  
  8. void factors(unsigned long long u, set<unsigned long long>& fac)
  9. {
  10.     unsigned long long s = sqrt(u);
  11.  
  12.     for(unsigned long long i(2); i < s; ++i)
  13.     {
  14.         if(u % i == 0)
  15.         {
  16.             u /= i;
  17.             fac.insert(i);
  18.             fac.insert(u);            
  19.         }
  20.     }
  21. }
  22.  
  23. int main()
  24. {
  25.     set<unsigned long long> fac;
  26.  
  27.     unsigned long long num(64);
  28.  
  29.     factors(num, fac);
  30.  
  31.     for(auto i : fac)
  32.         cout << i <<endl;
  33. }
  34.  
Success #stdin #stdout 0s 2988KB
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Standard input is empty
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https://ideone.com/y37OhY
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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