Merge Intervals
Merge all overlapping intervals Intervals [1,4] and [4,5] are considered overlapping Example: [[1,3],[2,6],[8,10],[15,18]] => [[1,6],[8,10],[15,18]]
This one is all about overlap reasoning and clean boundary handling. Interviewers love it because it reveals your overlap reasoning and your edge-case discipline. Be precise about inclusive/exclusive boundaries; that's what interviewers poke at.
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