DIY: Merge K Sorted Lists

Problem statement

You will be given multiple sorted lists and your task is to merge them into a single sorted list.

Input

The input will be a list of multiple sorted lists. The following is an example of input:

{
{2,4,6,8,10}
{1,3,5,7,9}
}

Output

The output should be a single sorted list. For the above input, the output should be:

{1,2,3,4,5,6,7,8,9,10}

Coding exercise

For this coding exercise, you need to implement the function mergeKLists(lists), where lists is the list of multiple sorted lists. This function will return a single list of sorted numbers.