TASK 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
PROBLEM: [15, 1, 3, 11, 8, 40, 4, 21, 17, 30, 23, 9, 45, 5, 25, 18, 42, 39, 22, 2], target=38

SOLUTION: [21, 17]

PROBLEM: [42, 7, 8, 49, 34, 48, 36, 22, 21, 28, 23, 38, 47, 31, 27, 6, 4, 5, 1, 29], target=67

SOLUTION: [36, 31]

PROBLEM: [26, 42, 1, 46, 15, 11, 23, 18, 4, 25, 39, 49, 30, 47, 13, 9, 29, 19, 2, 35], target=59

SOLUTION:
[46, 13]