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  1. #include <bits/stdc++.h>
  2. #define ull unsigned long long
  3.  
  4. using namespace std;
  5.  
  6. ull a, b, ile = 0;
  7.  
  8. bool prim(ull x) {
  9. 	for (ull i = 2; i * i <= x; i ++)
  10. 		if (x % i == 0)
  11. 			return 0;
  12. 	return 1;
  13. }
  14.  
  15. void rekDokl(ull x) {
  16. 	if (x > b or !prim(x))
  17. 		return;
  18. 	if (prim(x) and x >= a)
  19. 		ile ++;
  20.  
  21. 	rekDokl(x * 10 + 1);
  22. 	rekDokl(x * 10 + 3);
  23. 	rekDokl(x * 10 + 7);
  24. 	rekDokl(x * 10 + 9);
  25. }
  26.  
  27. int main() {
  28. 	ios_base::sync_with_stdio(0);
  29. 	cin.tie(0); cout.tie(0);
  30. 	cin >> a >> b;
  31.  
  32. 	rekDokl(2);
  33. 	rekDokl(3);
  34. 	rekDokl(5);
  35. 	rekDokl(7);
  36.  
  37. 	cout << ile;
  38. }
Success #stdin #stdout 0.01s 5536KB
comments (?)
stdin
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1 1000000000000000000
stdout
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83
https://ideone.com/fo61Mm
language:
C++14 (clang 8.0)
created:
1 year ago
visibility:
secret

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