Daily Coding Problem: Problem #1254 [Hard]

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

This problem was asked by Microsoft.

Let X be a set of n intervals on the real line. We say that a set of points P "stabs" X if every interval in X contains at least one point in P. Compute the smallest set of points that stabs X.

For example, given the intervals [(1, 4), (4, 5), (7, 9), (9, 12)], you should return [4, 9].

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