Leetcode - 57 Insert Interval 解题报告

Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary).

You may assume that the intervals were initially sorted according to their start times.

Example 1:
Given intervals [1,3],[6,9], insert and merge [2,5] in as [1,5],[6,9].

Example 2:
Given [1,2],[3,5],[6,7],[8,10],[12,16], insert and merge [4,9] in as [1,2],[3,10],[12,16].

This is because the new interval [4,9] overlaps with [3,5],[6,7],[8,10].

 

分析:

1. 这道题分成2个部分, 简单的部分是在newInterval 外侧的剩余intervals, 可以用两个while语句加到result中.

2. 本题难点在于如何把夹在中间的interval合并在一起 :

　　基本思想在于iterating, 把newInterval依次与夹在newInterval内的小interval合并 并且同时变成中间相(这里方便起见可以替换原来的newInterval),直到 newInterval.end小于某一个intervals.get(i).end. 然后加入到result中

代码: