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This is fairly old Leetcode problem (who probably got it from somewhere else)

https://leetcode.com/problems/burst-balloons/description/

Its tricky and if I got this problem in a tech interview, I would be hard-pressed to solve it in 45 minutes if I hadn't seen it before

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yeah, i would expect a candidate who hasn’t seen it before to have at best a 50/50 shot of realizing that the traversal is “in reverse” so to speak, and need a hint to move forward.

though once you know that i’d expect a candidate to bang it out fairly quickly. it’s not that many lines of code.

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