Update Subsets.java

Submission Result: Compile Error

Line 8: cannot find symbol: variable S

Submission Result: Compile Error

Line 24: cannot find symbol: class subsets

Submission Result: Wrong Answer

Input:	[4,1,0]
Output:	[[4],[],[4,1],[1],[4,0],[0],[4,1,0],[1,0]]
Expected:	[[],[0],[1],[4],[0,1],[0,4],[1,4],[0,1,4]]