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  1. #include"bits/stdc++.h"
  2.  
  3. const int M=1e7;
  4. const int MD=1e9+7;
  5. using namespace std;
  6. typedef long long ll;
  7. ll p[M];
  8. bool ans[M];
  9. int dig(int n)
  10. {
  11. 	int su=0;
  12. 	while(n>0)
  13. 	{
  14. 		su+=n%10;
  15. 		n=n/10;
  16. 	}
  17. 	return su;
  18. }
  19. void sieve()
  20. {
  21. 	for(int i=2;i<=1000000;i++)
  22. 	{
  23. 		if(ans[i]) continue;
  24. 		p[i]=dig(i);
  25. 		for(int j=i+i;j<=M;j+=i)
  26. 		{
  27. 		   ans[j]=true;
  28. 		   p[j]+=p[i];
  29. 		}
  30. 	}
  31. 	for(int i=1;i<=M;i++)
  32. 	p[i]+=p[i-1];
  33. }
  34. int main() {
  35. 	sieve();
  36. 	int t;
  37. 	cin>>t;
  38. 	while(t--)
  39. 	{
  40. 		int l,r;
  41. 		cin>>l>>r;
  42. 		cout<<p[r]-p[l-1]<<endl;
  43. 	}
  44. 	return 0;
  45. }
Runtime error #stdin #stdout 0.47s 103936KB
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https://ideone.com/nabraD
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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