Time: 45mins
Question: Given an integer array that represents a list of package weights, return a list of weight transfer from package[i] to package[j] so that each package contains same weight of items.

input: 
[6,20,18,12,4]  // average weight is 12
output:
[
	[1,0,6],  // p[1] -> p[0] 6 lbs, p[0] = 12, p[1] = 14 
	[1,4,2],  // p[1] -> p[4] 2 lbs, p[1] = 12, p[4] = 6
	[2,4,6]   // p[2] -> p[4] 6 lbs, p[2] = 12, p[4] = 12 
]

It's an easy question though, anyone knows if LC has similar one?