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].

(merge if necessary).

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

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

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].

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