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:
[38, 29, 22, 9, 18, 35, 7, 42, 15, 48, 10, 11, 26, 46, 49, 45, 36, 24, 41, 40], target=11
answer:
[]


question:
[36, 18, 12, 48, 39, 30, 19, 1, 34, 21, 17, 49, 44, 37, 47, 6, 26, 2, 28, 23], target=29
answer:

[12, 17]