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re: I am sorry that my explanation didn't help. :( That's because the (I forget the name of the linked example . . . flatten()?) the second example i...

did you write this code simply based on the "leap of faith"?

Yes. Totally based on the leap of faith. It always work! It's the very important thing you need when dealing with recursion.

Is this how algorithms like merge sort and quick were written?

Well, merge sort and quick sort if written in a recursive way, can be reasoned about using the "leap of faith" for sure. Whether or not the original Author has the leap of faith there is noway to find out. 😂😂

Is leap of faith good enough for serious professional/interview problems?

Leap of faith will definitely work in professional and interview problems. It's just a mindset you should have when writing recursive solutions, not really a method. Once you do more recursion, you will become confident enough to hold that faith all time.

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