When multiple objects of weight are given,
Obtain the maximum number of objects that can be balanced
ex)
input : [2,4,4,6]
output : 3 ( [2,4,6] ), (not [4,4] = 2)
.....|
..-----
..|.....|
----..6
|....|
2..4
the number of objects : 1~100,000
the weight of an object : 1~100,000