Loading collection data...
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.
True, I have no idea why I've decided to use this function
This technically shouldn't count as valid since it will consider strings containing numbers as okay.
Yes, it's a good solution in one line, but it does not use memory effective. We have a memory limit exception if parameter $n is huge number (for example, 1 Gb of memory is not enough if $n = 17 millions).
Please use spoiler flag next time.
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Didn't know we could ust str_replace with arrays, thanks!
This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution