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.
Yep, spent an hour on this until I realized that the test was broken. The test is written for pre-order traversal, not level order traversal.
Good point, added to description.
Wow, very nice. Simple and clever.
Good point, changed function name to mergedsorted.
Good starter problem. Maybe one or two more sample unit tests might be useful. Otherwise, good question!