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:
[10, 6, 3, 21, 4, 13, 2, 16, 41, 17, 26, 39, 37, 31, 29, 18, 15, 9, 45, 47], target=87
answer:
[]


question:
[12, 42, 19, 39, 30, 16, 48, 7, 4, 47, 43, 18, 6, 11, 21, 20, 32, 22, 25, 5], target=39
answer:
[18, 21]


question:
[46, 35, 1, 11, 45, 23, 26, 22, 37, 43, 18, 40, 4, 36, 39, 20, 16, 28, 5, 2], target=58
answer:

[35, 23]