Definition: You are given a list of integers and an integer target, return a list of a pair of numbers in any order such that they add up to target. If there is no such pair of numbers, then return an empty list
Input: [42, 41, 13, 46, 15, 28, 38, 29, 45, 35, 37, 9, 16, 18, 30, 14, 26, 7, 12, 48], target=20
Output:
[13, 7]