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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.
Sorry, it turns out, I was wrong.
I found a mistake in my program.
You are right. All puzzles have one possible solution.
"All puzzles have one possible solution." - that not exactly right.
"Test_1_hard" have 470 possible solutions.
"Test_2_hard" have 42 possible solutions.
"Test_4_very_hard" have 686 possible solutions.
Does "int check()" take this into account?