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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.
First time to see a bfs implemented with while-loop and queue and the code is very delicate, Thanks.
I tried your solution, it reports
"STDERR
Execution Timed Out (12000 ms)"