You will be given a definition of a task first, then some input of the task.
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

[22, 23, 45, 37, 25, 10, 2, 18, 17, 20, 3, 34, 13, 21, 28, 39, 31, 43, 33, 40], target=100
Output:
[]