instruction:
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
question:
[39, 30, 17, 47, 19, 23, 44, 5, 20, 1, 8, 42, 48, 11, 34, 6, 26, 13, 18, 4], target=43
answer:
[23, 20]


question:
[33, 20, 3, 10, 11, 28, 44, 26, 6, 31, 40, 46, 15, 47, 8, 48, 34, 30, 4, 29], target=27
answer:
[]


question:
[30, 4, 39, 18, 25, 36, 43, 22, 13, 23, 8, 19, 49, 3, 27, 35, 28, 1, 20, 37], target=27
answer:

[4, 23]