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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef long long int lli;
  5.  
  6. int main(){
  7.    lli in,ans = 0;
  8.    cin >> in;
  9.  
  10.    if(in < 10)
  11.       cout << in << endl;
  12.    else{
  13.       lli digits = 0;
  14.       lli temp = in;
  15.       while(temp > 0){
  16.          digits++;
  17.          temp /= 10;
  18.       }
  19.       digits--;
  20.  
  21.       while(in > 0){
  22.          //cout << "in: " << in << endl;
  23.          //cout << "digits: " << digits << endl;
  24.  
  25.          ans += ((in - (pow(10,digits) - 1)) * (digits + 1));
  26.          in = in -  (in - (pow(10,digits) - 1));
  27.          digits--;
  28.  
  29.          if(in == 9){
  30.             ans+= 9;
  31.             break;
  32.          }
  33.       }
  34.       cout << ans << endl;
  35.    }
  36. }
Success #stdin #stdout 0s 3416KB
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https://ideone.com/zOvHzW
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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