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  1. #include<iostream>
  2. #include<cstdio>
  3. #include<vector>
  4. #include<cmath>
  5. #include<climits>
  6. using namespace std;
  7. int main(){
  8.  
  9. 	long long n;
  10. 	cin>>n;
  11. 	long long x=n;
  12. 	long long count=0;
  13. 	while(x>0){
  14.  
  15. 		count++;
  16. 		x/=10;
  17. 	}
  18. 	long long ans=0;
  19. 	ans=(n-pow(10,count-1)+1)*count;
  20. 	for(long long i=count-2;i>=0;i--){
  21.  
  22. 		ans+=9*pow(10,i)*(i+1);
  23. 	}
  24. 	cout<<ans<<endl;
  25. }
Success #stdin #stdout 0s 2732KB
comments (?)
stdin
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1000000000
stdout
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8888888899
https://ideone.com/U98Nb2
language:
C++ 4.3.2 (gcc-4.3.2)
created:
9 years ago
visibility:
public

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