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: [39, 41, 1, 42, 18, 21, 32, 40, 35, 45, 4, 43, 28, 8, 16, 17, 29, 26, 23, 22], target=51
Output:
[43, 8]