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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.
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Seems some people missed the same thing as I did, the words "right away".
In this sentence =>
"Going to one direction and coming back the opposite direction right away is a needless effort."
This means that its only adjecent directions in the array that should be checked if they are needed or not.
So:
W - E - S => S
W and E cancels out, not needed and adjecent.
BUT
W - S - E => W - S - E
Here S is between W and E, so they do NOT cancel out. W and E are not adjecent and are therefore not "...oposite direction right away..."
This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution