Description
Given a collection of intervals, merge all overlapping intervals.
Example 1:
Input: [[1,3],[2,6],[8,10],[15,18]]
Output: [[1,6],[8,10],[15,18]]
Explanation: Since intervals [1,3] and [2,6] overlaps, merge them into [1,6].
Solution
先根据开始时间sort
循环遍历 start & end ,如果到来的start大于maintain 的end, 则生成新的interval
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