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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4. int tongChuSo ( int n ){
  5. 	int sum = 0;
  6. 	while( n>0){
  7. 		sum += n % 10;
  8. 		n /= 10;
  9. 	}
  10. 	return sum;
  11. }
  12.  
  13. bool snt( int n ){
  14. 	if(n < 2) return 0;
  15. 	for(int i=2 ; i<=sqrt(n) ; i++){
  16. 		if(n % i == 0) return 0;
  17. 	}
  18. 	return 1;
  19. }
  20. int main() {
  21. 	int l , r;
  22. 	cin>>l>>r;
  23. 	int ans=0;
  24. 	for(int i=l+1;i<r;i++){
  25. 		if(snt(tongChuSo(i))) ans++;
  26. 	}
  27.     cout<<ans<<endl;
  28. 	return 0;
  29. }
Success #stdin #stdout 0.09s 5284KB
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https://ideone.com/bRgBBB
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
secret

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