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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main(){
  5. 	int n = 110;
  6. 	bool data[n], res[n];
  7. 	int i, j;
  8. 	for(i=0;i!=n;++i) data[i]=true;
  9.  
  10. 	for(i=2;i<=n/2+1;++i){
  11. 		if(data[i]){
  12. 			j=i*2;
  13. 			while(j<n){
  14. 				data[j]=false;
  15. 				j+=i;
  16. 			}
  17. 		}
  18. 	}
  19.  
  20. 	for(i=0;i!=n;++i)
  21. 		res[i]=data[i];
  22.  
  23. 	int a, b, k;
  24. 	cin >> a >> b >> k;
  25.  
  26. 	i=a;
  27. 	while(i>0){
  28. 		if(data[i])
  29. 			break;
  30. 		--i;
  31. 	}
  32. 	for(j=i;j<=i+k;++j)
  33. 		res[j]=true;
  34.  
  35. 	i=b;
  36. 	while(i<n){
  37. 		if(data[i])
  38. 			break;
  39. 		++i;
  40. 	}
  41.  
  42. 	for(j=i;j>=i-k;--j)
  43. 		res[j]=true;
  44.  
  45. 	for(i=a;i<=b;++i)
  46. 		if(data[i])
  47. 			for(j=((i-k<0)?0:i-k);j<=((i+k>=n)?n-1:i+k);++j)
  48. 				res[j]=true;
  49.  
  50. 	int kilk=0;
  51. 	for(i=a;i<=b;++i)
  52. 		if(!res[i])
  53. 			++kilk;
  54. 	cout << kilk << endl;
  55.  
  56. 	return 0;
  57. }
Success #stdin #stdout 0s 3344KB
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https://ideone.com/vuV0IX
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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