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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.
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Could you please add real randomized integer tests for positive scenarios?
I could actually pass this kata just hard-coding all positive cases, and evaluating to -1 otherwise.
It's not hard to get all test inputs.
Since I've seen 'randomized integers' in test output, I assume that randomized tests are either broken or defined only for cases when -1 is expected as a result, i. e. negative ones.
Check how long your code will run for m = 1025247423603083074023000250000 :)