MediumArraysAI interview only
Merge Intervals
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01 · Problem
Given an array of intervals where intervals[i] = [start_i, end_i], merge all overlapping intervals, and return an array of the non-overlapping intervals that cover all the intervals in the input.
02 · Examples
Example 01
Input
intervals = [[1,3],[2,6],[8,10],[15,18]]
Output
[[1,6],[8,10],[15,18]]
Intervals [1,3] and [2,6] overlap, so they are merged into [1,6]. The remaining intervals do not overlap.
Example 02
Input
intervals = [[1,4],[4,5]]
Output
[[1,5]]
Intervals [1,4] and [4,5] share the endpoint 4, so they are merged into [1,5].
Example 03
Input
intervals = [[1,4],[0,4]]
Output
[[0,4]]
The two intervals overlap completely, merging into [0,4].
03 · Constraints
- 011 <= intervals.length <= 104
- 02intervals[i].length == 2
- 030 <= start_i <= end_i <= 104
04 · Optimal complexity
- Time
- O(n log n)
- Space
- O(n)
05 · Two ways to work on it
Practice it alone or rehearse it as an interview.
Practice Mode gives you an editor and test runs, nothing else. AI Interview Mode puts a voice interviewer on the other side, adds a clock, and ends with a scored summary of the round.