Query Bits ( Stuck )

#1

I am not able to get the idea behind the problem!!

#2

??? Can I get a reply??

#3

You will have to store result forming by 2 child nodes in the parent node. Very smartly you have to calculate that number.
How would you for number if i say concatenate 1001 and 001 ?
You will multiply first string with some power of 2 and then add second string in it right?
The same way you do with decimal numbers… Its just that.

#4

Ooo… got it. Thanks