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  1. #include <bits/stdc++.h>  
  2. using namespace std;  
  3. #define lli long long int
  4. const int MAX=1e9+7;
  5. #define EPS 1e-9
  6. lli solve(lli n){
  7. 	lli sz=log10(n)+EPS+1;
  8. 	if(sz==1)return n;
  9. 	lli ans=9+(n-pow(10,sz-1)+EPS+1)*sz;
  10. 	for(int i=sz-1;i>1;i--){
  11. 		ans+=9*i*(pow(10,i-1)+EPS);
  12. 	}
  13. 	return ans;
  14. }
  15. int main()  
  16. {  
  17.  
  18. 		lli n;
  19. 		cin>>n;
  20.     	cout<<solve(n)<<"\n";
  21.   	return 0;  
  22. }  
  23.  
Success #stdin #stdout 0s 3144KB
comments (?)
stdin 
1000000000
stdout 
8888888899
https://ideone.com/kgmwf3
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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