Grokking the Coding Interview: Patterns for Coding Questions
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Merge Intervals (medium)
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Problem Statement

Given a list of intervals, merge all the overlapping intervals to produce a list that has only mutually exclusive intervals.

Example 1:

Intervals: [[1,4], [2,5], [7,9]]
Output: [[1,5], [7,9]]
Explanation: Since the first two intervals [1,4] and [2,5] overlap, we merged them into one [1,5].

Example 2:

Intervals: [[6,7], [2,4], [5,9]]
Output: [[2,4], [5,9]]
Explanation: Since the intervals [6,7] and [5,9] overlap, we merged them into one [5,9].

Example 3:

Intervals: [[1,4], [2,6], [3,5]]
Output: [[1,6]]

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