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.
This comment is hidden because it contains spoiler information about the solution
Awesome!
I got the same error, and got sucked in it for a long time.
What does \xef\xbf\xbd mean?
It's not best practice to use lst.pop(idx) where idx comes from another related(mapping) list,
it may break the relationship.
Although it is OK here..
This solution depends on the order of the input arguments