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Aug 20th, 2019
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  1. #include<iostream>
  2. #include<bits/stdc++.h>
  3.  
  4. using namespace std;
  5.  
  6. int main()
  7. {
  8. long long n;
  9. cin>>n;
  10. long long decimalNumber = 0, i = 0, remainder;
  11. while (n!=0)
  12. {
  13. remainder = n%10;
  14. n /= 10;
  15. decimalNumber += remainder*pow(2,i);
  16. ++i;
  17. }
  18. // cout<<decimalNumber<<endl;
  19. int pos=0;
  20. for(int j=0;j<pow(2,100);j++)
  21. {
  22. if(pow(4,j)<decimalNumber)
  23. {
  24. pos++;
  25. }
  26. else
  27. break;
  28. }
  29. cout<<pos<<endl;
  30. return 0;
  31. }
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