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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. int main()
  5. {
  6.     const int max = 1000000;
  7.     std::vector<std::size_t> a(max);
  8.  
  9.     for(std::size_t i = 1; i != a.size(); ++i) {
  10.         for (std::size_t j = 2 * i; j < a.size(); j += i) {
  11.             a[j] += i;
  12.         }
  13.     }
  14.     for (std::size_t i = 1; i != a.size(); ++i) {
  15.         if(a[i] == i) {
  16.             std::cout << i << " is a perfect number!" << std::endl;
  17.         }
  18.     }
  19. }
  20.  
Success #stdin #stdout 0.14s 3340KB
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stdin
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Standard input is empty
stdout
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6 is a perfect number!
28 is a perfect number!
496 is a perfect number!
8128 is a perfect number!
https://ideone.com/IpZY9e
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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