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:
[17, 30, 8, 1, 12, 26, 35, 3, 37, 39, 38, 11, 14, 16, 6, 40, 25, 19, 42, 4], target=77
answer:
[39, 38]

question:
[29, 6, 2, 15, 49, 13, 36, 44, 43, 21, 1, 30, 10, 23, 12, 48, 41, 47, 32, 39], target=83
answer:
[36, 47]

question:
[35, 31, 33, 45, 20, 30, 17, 25, 18, 49, 10, 16, 8, 44, 48, 21, 37, 13, 5, 27], target=99
answer: