LeetCode---90. Subsets II

题目

给出一个数组，里面可能包含重复元素，返回所有的子数组。注意：不能包含重复的子数组。

Python题解

class Solution(object):
    def subsetsWithDup(self, nums):
        """
        :type nums: List[int]
        :rtype: List[List[int]]
        """
        nums.sort()
        path, res = [], []
        self.dfs(nums, 0, path, res)
        return res

    def dfs(self, nums, index, path, res):
        res.append(path)
        for i in range(index, len(nums)):
            if i > index and nums[i] == nums[i - 1]:
                continue
            self.dfs(nums, i + 1, path + [nums[i]], res)