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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     long long int n,m,sum=0,i=10,z;
  6.     cin>>n;
  7.     m=n;
  8.  
  9.     while(i!=0)
  10.     {
  11.         n=m- (long long int)pow(10,i);
  12.         if(n>=0)
  13.         {
  14.         m=m-n-1;
  15.         //cout<<m;
  16.         sum=sum+(n+1)*(i+1);
  17.         }
  18.         i--;
  19.     }
  20.  
  21.     cout<<sum+m<<endl;
  22.  
  23. // your code goes here
  24.     return 0;
  25. }
Success #stdin #stdout 0s 3100KB
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https://ideone.com/Jdt8it
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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