Given a set of distinct integers,?nums, return all possible subsets.
Note:?The solution set must not contain duplicate subsets.
For example,
If?nums=[1,2,3], a solution is:
[[3], [1], ?[2], [1,2,3], [1,3], [2,3], [1,2], [] ]
start 的index 是關鍵
Given a set of distinct integers,?nums, return all possible subsets.
Note:?The solution set must not contain duplicate subsets.
For example,
If?nums=[1,2,3], a solution is:
[[3], [1], ?[2], [1,2,3], [1,3], [2,3], [1,2], [] ]
start 的index 是關鍵