Why output is 2 , I think it should be 22 , because the worm started from the first sheet of vol 1 and goes until last sheet of vol 2 . so it's path is 10+1+1+10 = 22

No comments

if "NO COMMENTS" why you write this?
information - Zero

You should know, that answer "No comments" is identical to "Read the problem statement"

You could have written explanation or something instead of writing no comments. Its like making fun of the guy, like jewish do.

Try to put two books in a bookshelf, and see the reason for no comments :D

what answer will be for test like this:
10 1 3 1
zero?

>what answer will be for test like this:
>10 1 3 1

Answer is 34.

No
for the case 10 1 3 1

Answer is 12

You seem to be an anti-Semite! Jewish are not guilty of your stupidity

Are there no moderators here? Hateful comments should be instantly removed and the idiots who post them should be temporarily or permanently banned!

Think of the reputation of this otherwise great site!

No. You are wrong. My ACed solusion also gave 34. Even if you solve it by hand it is the same result.
Because books are [from first ][][ to last]
There are 4 symbols of [ and ] that are book covers.
So, three books and 4 covers of the books that worm had gnawed.

Ok, the problem statement doesn't clarify that this book is an LTR language (left to right, e.g. English) book.Shuch a crucial info shouldn't be left to the assumptions of the reader.