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  1. #include <iostream>
  2. #include <cinttypes>
  3. #include <vector>
  4.  
  5. size_t f(size_t n) {
  6. 	size_t r = 1;
  7. 	std::vector<uint8_t> sieve(n + 1, 1);
  8. 	for (size_t i = 2; i <= n; ++i) {
  9. 		if (sieve[i]) {
  10. 			for (size_t j = i + i; j <= n; j += i)
  11. 			    sieve[j] = 0;
  12.  
  13. 			size_t p = i;
  14. 			while (p * i <= n)
  15. 			    p = p * i;
  16.  
  17. 			r *= p;
  18. 		}
  19. 	}
  20.  
  21. 	std::cout << n << " " << r << std::endl;
  22. 	return r;
  23. }
  24.  
  25. int main() {
  26. 	f(10);
  27. 	f(20);
  28. 	return 0;
  29. }
Success #stdin #stdout 0s 4200KB
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10 2520
20 232792560
https://ideone.com/rOFnlG
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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