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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.
Same here! I'm used to Python and just finished a Java crash course. Went straight here so I could learn all the different methods I could use.
нажимаю Compare with your solution и вижу твой и мой код))
function valid($n) вот это прикольно))
dechex -число из 10-ной
str_pad — Дополняет строку другой строкой до заданной длины (хорошая находка)