78. Subsets(中等，集合的子集，经典问题 DFS)

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[LeetCode] 78. Subsets 子集合

Given a set of distinct integers, 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 = [1,2,3], a solution is: [ [3], [1], [2], [1,2,3], [1…

78. Subsets(中等，集合的子集，经典问题 DFS)

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], [] ] 就是求指定集合的所有子集．三种解法: Rec…

[LeetCode] Subsets 子集合

Given a set of distinct integers, 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 = [1,2,3], a solution is: [ [3], [1], [2], [1,2,3], [1…

LeetCode OJ 78. Subsets

Given a set of distinct integers, 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 = [1,2,3], a solution is: [ [3], [1], [2], [1,2…

刷题78. Subsets

一.题目说明题目78. Subsets,给一列整数,求所有可能的子集.题目难度是Medium! 二.我的解答这个题目,前面做过一个类似的,相当于求闭包: 刷题22. Generate Parentheses 算了,用最简单的回溯法吧: class Solution{ public: void dfs(vector<int>& nums,int start){ r.push_back(path); for(int i=start;i<len;i++){ path.push_ba…

python 实现求一个集合的子集

概要今天偶然看到有个关于数学中集合的问题,就突发奇想的想用python实现下求一个集合的子集. 准备我当然先要复习下,什么是集合,什么是子集? 比较粗犷的讲法,集合就是一堆确定的东西,细致一点的讲法呢,就是由一个或多个确定的元素所构成的整体,集合中的东西称为元素. 集合有一些特性: 1.确定性给定一个集合,任给一个元素,该元素或者属于或者不属于该集合,二者必居其一,不允许有模棱两可的情况出现. 2.互异性一个集合中,任何两个元素都认为是不相同的,即每个元素只能出现一次.有时需要对同一元素…

78. Subsets(M) & 90. Subsets II(M) & 131. Palindrome Partitioning

78. Subsets Given a set of distinct integers, nums, return all possible subsets. Note: The solution set must not contain duplicate subsets. For example, If nums = [,,], a solution is: [ [], [], [], [,,], [,], [,], [,], [] ] class Solution { public: v…