leetcode 90. subsets

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[LeetCode] 90.Subsets II tag: backtracking

Given a collection of integers that might contain duplicates, nums, return all possible subsets (the power set). Note: The solution set must not contain duplicate subsets. Example: Input: [1,2,2] Output: [ [2], [1], [1,2,2], [2,2], [1,2], [] ] 这个题目思路…

[leetcode]90. Subsets II数组子集(有重)

Given a collection of integers that might contain duplicates, nums, return all possible subsets (the power set). Note: The solution set must not contain duplicate subsets. Input: [1,2,2] Output: [ [2], [1], [1,2,2], [2,2], [1,2], [] ] 题意: 是的[leetcode…

[LeetCode] 90. Subsets II 子集合 II

Given a collection of integers that might contain duplicates, nums, return all possible subsets (the power set). Note: The solution set must not contain duplicate subsets. For example,If nums = [1,2,2], a solution is: [ [2], [1], [1,2,2], [2,2], [1,2…

LeetCode 90. Subsets II （子集合之二）

Given a collection of integers that might contain duplicates, nums, return all possible subsets. Note: The solution set must not contain duplicate subsets. For example,If nums = [1,2,2], a solution is: [ [2], [1], [1,2,2], [2,2], [1,2], [] ] 题目标签:Arr…

[LeetCode] 90. Subsets II 子集合之二

Given a collection of integers that might contain duplicates, S, return all possible subsets. Note: Elements in a subset must be in non-descending order. The solution set must not contain duplicate subsets. For example,If S = [1,2,2], a solution is:…

Leetcode#90 Subsets II

原题地址跟Subsets(参见这篇文章)类似. 但因为有重复元素,所以要考虑去重问题. 什么情况下会出现重复呢?比如S = {5, 5, 5},如果要选1个5,一共有C(3,1)=3种选法,即100, 010, 001,这三种情况在集合的角度看是重复的情况.如果要选2个5,共有C(3,2)=3种选法,即011, 101, 110,这三种情况在集合的角度上看也是重复的. 本质在于,如果要在重复出现的数字当中选择若干个,则只能保留一种取法,其他的都是重复.即,这些重复数字对应的二进制位当中,只能保…

leetCode 90.Subsets II（子集II）解题思路和方法

Given a collection of integers that might contain duplicates, nums, return all possible subsets. Note: Elements in a subset must be in non-descending order. The solution set must not contain duplicate subsets. For example, If nums = [1,2,2], a soluti…