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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.
Situations like you mentioned ( 3 being writen as 'IIV' ) won't occur since 'IIV' is not a valid roman number (Kata was to create a decoder for VALID roman numbers)
I know. I added that assertion to check.
About that test-issue with 45001 in C++: it is funny that it fails on "attempt" but while you use the same data ( so you give an amount of cubes you need to build 45001-layers pile ) on sample tests it works perfectly fine.