Hm, this is pretty cool. I really like how this generates test cases by code inspection.
However, some of the puzzles are really obscure. For example, Im talking about that one which has an int x as parameter, which has tests like 0 -> 0, 1 -> 0 and 769 -> some really arbitrary number. Those are just not fun.
Those are the ones I'm enjoying the most - usually I get a larger value as the parameter in the first or second run, and I can make some sort of connection between the parameter and the result to refine my function accordingly. (It's rather hard to get the right function out of 2->6, which was the first run for my first test, but once I got 789->310866 I was able to get the right answer after only two more tests).
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