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: [31, 24, 30, 42, 33, 26, 47, 29, 7, 16, 3, 39, 10, 6, 15, 49, 12, 19, 2, 18], target=59

SOLUTION: [33, 26]

PROBLEM: [35, 38, 44, 37, 28, 18, 9, 6, 42, 7, 15, 45, 43, 24, 22, 21, 23, 2, 39, 19], target=58

SOLUTION: [15, 43]

PROBLEM: [38, 44, 45, 4, 43, 40, 41, 42, 48, 10, 32, 3, 47, 20, 17, 28, 31, 34, 27, 2], target=21

SOLUTION:
[4, 17]