Given an array of intervalswhere intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cover all the intervals in the input.

Example 1:

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Input: intervals = [[1,3],[2,6],[8,10],[15,18]]Output: [[1,6],[8,10],[15,18]]Explanation: Since intervals [1,3] and [2,6] overlap, merge them into [1,6].

Example 2:

Input: intervals = [[1,4],[4,5]]Output: [[1,5]]Explanation: Intervals [1,4] and [4,5] are considered overlapping.

Constraints:

1 <= intervals.length <= 104

intervals[i].length == 2

0 <= starti <= endi <= 104

没想到居然能超过98%。。。

Runtime: 7 ms, faster than 98.90% of Java online submissions for Merge Intervals.

Memory Usage: 47.6 MB, less than 36.26% of Java online submissions for Merge Intervals.