Daily Coding Problem: Problem #909 [Medium]

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

This problem was asked by Google.

Given a set of closed intervals, find the smallest set of numbers that covers all the intervals. If there are multiple smallest sets, return any of them.

For example, given the intervals [0, 3], [2, 6], [3, 4], [6, 9], one set of numbers that covers all these intervals is {3, 6}.

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