Daily Coding Problem: Problem #975 [Hard]

Good morning! Here's your coding interview problem for today.

This problem was asked by Apple.

You are going on a road trip, and would like to create a suitable music playlist. The trip will require N songs, though you only have M songs downloaded, where M < N. A valid playlist should select each song at least once, and guarantee a buffer of B songs between repeats.

Given N, M, and B, determine the number of valid playlists.

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