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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.
bfs with cannot pass when the maze is large, dfs would be more stable.
A simple vector would be good enough for 26-characters.