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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
why do we check for index!=0?
This comment is hidden because it contains spoiler information about the solution
make sure to add 1 when you return the value. as end-start-1 would give the total number of elements for program to run through.
yes. it can have 5 in the answer but not the start key.
good to know people with great cleverness!