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# Merge Overlapping Intervals

Problem Description

Given a collection of intervals, merge all overlapping intervals.

Problem Constraints

1 <= Total number of intervals <= 100000.

Input Format

First argument is a list of intervals.

Output Format

Return the sorted list of intervals after merging all the overlapping intervals.

Example Input

Input 1:

`[1,3],[2,6],[8,10],[15,18]`

Example Output

Output 1:

`[1,6],[8,10],[15,18]`

Example Explanation

Explanation 1:

```Merge intervals [1,3] and [2,6] -> [1,6].
so, the required answer after merging is [1,6],[8,10],[15,18].
No more overlapping intervals present.```

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.
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