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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define mod 1000000007
  4. #define ll long long int
  5. using namespace std;
  6. vector <int>pref;
  7. int main()
  8. { 
  9.  
  10. 	for(ll i = 1; i <1000000001; ++i)
  11. 	{
  12. 		ll x= pref[i-1]+(int)(log10(i)+1)*i;
  13. 		pref.push_back(x);
  14. 	}
  15.  
  16. 	ll l,r;
  17. 	ll t;
  18. 	cin>>t;
  19.  
  20. 	while(t--)
  21. 	{
  22. 		scanf("%d%d",&l,&r);
  23. 		printf("%lld\n", pref[r]-pref[l-1]);
  24. 	}
  25. 	return 0;
  26. }
  27.  
  28.  
Runtime error #stdin #stdout 0s 15240KB
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Standard input is empty
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Standard output is empty
https://ideone.com/LhnETw
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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