78. Subsets

Given a set of distinct integers, nums, return all possible subsets (the power set).

Note: The solution set must not contain duplicate subsets.

Example:

Input: nums = [1,2,3]
Output:
[
  [3],
  [1],
  [2],
  [1,2,3],
  [1,3],
  [2,3],
  [1,2],
  []
]

Code：

class Solution(object):
    def subsets(self, nums):
        """
        :type nums: List[int]
        :rtype: List[List[int]]
        """
        res = []
        self.dfs(sorted(nums), 0, [], res)
        return res
    
    def dfs(self, nums, index, path, res):
        res.append(path)
        for i in range(index, len(nums)):
            self.dfs(nums, i+1, path+[nums[i]], res)