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  1. #include <iostream>
  2. #include <vector>
  3. #include <string>
  4. #include <cmath>
  5.  
  6. using namespace std;
  7.  
  8. void factors(unsigned long long u, vector<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.             fac.push_back(i);
  17.             u /= i;
  18.         }
  19.     }
  20. }
  21.  
  22. int main()
  23. {
  24.     vector<unsigned long long> fac;
  25.  
  26.     unsigned long long num(600851475143);
  27.  
  28.     factors(num, fac);
  29.  
  30.     for(auto i : fac)
  31.         cout << i <<endl;
  32. }
  33.  
Success #stdin #stdout 0.01s 2984KB
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71
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https://ideone.com/EH3Xxh
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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