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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.
I confirm there are not any, I just modified my code to return after finding one solution, it passes the fixed tests and rarely the random ones too (I had to spam "Attempt" a hundred times).
EDIT: my code prechecks that the initial number of filled squares is higher than 17 (otherwise we are sure there are multiple solutions), maybe that's the issue. There should be cases with more than 17 squares filled and multiple solutions.
Why golf?
but there are fixed tests with multiple solutions... :o => ?
congrats! ;)