
1.题目描述
Given a collection of integers that might contain duplicates, nums, return all possible subsets (the power set).
给定一个可能包含重复元素的整数数组 nums,返回该数组所有可能的子集(幂集)。
Note: The solution set must not contain duplicate subsets.
说明:解集不能包含重复的子集。
Example:
Input: [1,2,2]
Output:
[
[2],
[1],
[1,2,2],
[2,2],
[1,2],
[]
]
2.Solutions
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public static List<List<Integer>> subsetsWithDup(int[] nums) { List<List<Integer>> list = new ArrayList<>(); Arrays.sort(nums); backtrack(list, new ArrayList<>(), nums, 0); return list; }
private static void (List<List<Integer>> list, List<Integer> tempList, int [] nums, int start){ list.add(new ArrayList<>(tempList)); for(int i = start; i < nums.length; i++){ if(i > start && nums[i] == nums[i-1]) continue; tempList.add(nums[i]); backtrack(list, tempList, nums, i + 1); tempList.remove(tempList.size() - 1); } }
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参考:78. Subsets
(完)
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