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  1. #include <cstdio>
  2. #include <cstdlib>
  3. #include<cstring>
  4. #include <stdio.h>
  5. #include <iostream>
  6. #include <algorithm>
  7.  
  8. #include<math.h>
  9. using namespace std;
  10. int main() {
  11.     long long num=0;
  12.     long long numTemp=0;
  13.  
  14.     int numLen=0;
  15.  
  16.     long long sumLen=0;
  17.  
  18.     cin>>num;
  19.     numTemp=num;
  20.  
  21.     while(num>0)
  22.     {
  23.     	num/=10;
  24.     	numLen++;
  25.     }
  26.  
  27.     //cout<<numLen<<"\n";
  28.  
  29.     for(int i=1;i<numLen;i++)
  30.     {
  31.     	//cout<<pow(10,i-1)<<" "<<pow(10,i)-1<<" "<<(pow(10,i)-1 - pow(10,i-1)) + 1<<"\n";
  32.     	sumLen+=((pow(10,i)-1 - pow(10,i-1)) + 1) * i;
  33.     	//cout<<"sumLen for "<<sumLen<<"\n";
  34.     }
  35.  
  36.     sumLen+=(numTemp-pow(10,numLen-1) + 1) * numLen;
  37.     cout<<sumLen;
  38. }
Success #stdin #stdout 0s 3144KB
comments (?)
stdin 
1000000
stdout 
5888896
https://ideone.com/xX0bYC
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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