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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  long long pw(long long n){
  4. long long i=1;
  5. for (long j=0 ; j<n ; j++)  i*=10;
  6. return i;
  7.  
  8. }
  9. int main() {
  10.     long long int n,m,sum=0,i=10,z;
  11.     cin>>n;
  12.     m=n;
  13.  
  14.     while(i!=0)
  15.     {
  16.         n=m-pw(i);
  17.         if(n>=0)
  18.         {
  19.         m=m-n-1;
  20.         //cout<<m;
  21.         sum=sum+(n+1)*(i+1);
  22.         }
  23.         i--;
  24.     }
  25.  
  26.     cout<<sum+m<<endl;
  27.  
  28. // your code goes here
  29.     return 0;
  30. }
Success #stdin #stdout 0s 3100KB
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https://ideone.com/ypEdeI
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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