You are given a two dimensional array containing arrays of sorted integers as an argument. Return a new array combining all elements in sorted order.

There will never be duplicate integers.

Requirements

• Must return an array of integers
• Should work with both positive and negative integers

Example #1

solve([[1, 10, 20], [5, 15, 23], [3, 7, 25]])
> [1, 3, 5, 7, 10, 15, 20, 23, 25]

Example #2

solve([[-1, 10, 20], [-5, 15, 23], [-3, 7, 25]])
> [-5, -3 ,-1, 7, 10, 15, 20, 23, 25]