0056.merge-intervals

56. Merge Intervals

题目

Given a collection of intervals, merge all overlapping intervals.

For example,
Given [1,3],[2,6],[8,10],[15,18],
return [1,6],[8,10],[15,18].

解题思路

1. 先对 intervals 进行排序，按照 Start 递增
2. 依次处理重叠的情况。