题目意思:求解一个数组的所有子集,子集内的元素增序排列eg:[1,3,2] result:[],[1],[2],[1,2],[3],[1,3],[2,3],[1,2,3]思路:这是一个递推的过程 [] []+[1] [2]+[1,2]+[]+[1] 第k项的子集为第k个数分别加到k-1项的子集,再加上k-1项的子集程序过程:------------------- ans[0] []------------------- ans[1] [1]------------------- ans[2] […

［抄题］: 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],  …

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], [] ] 题意: 给定一个含不同整数的集…

[题目] Given a set of distinct integers, nums, return all possible subsets (the power set). Note: The solution set must not contain duplicate subsets. 求子集,无重复数 [思路] 1.有回溯法模板 2.将tmp加入进ans.tmp用来存放第i个元素的子集.回溯产生第i个元素与其后[i+1,len]元素产生的子集(i-1前已经产生过,不重复遍历).因第i…

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…

Medium! 题目描述: 给定一组不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). 说明:解集不能包含重复的子集. 示例: 输入: nums = [1,2,3] 输出: [ [3],   [1],   [2],   [1,2,3],   [1,3],   [2,3],   [1,2],   [] ] 解题思路: 这道求子集合的问题,由于其要列出所有结果,按照以往的经验,肯定是要用递归来做.这道题其实它的非递归解法相对来说更简单一点,下面我们先来看非递归的解法,由于题目要求子…

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…

A - A Time Limit:0MS     Memory Limit:0KB     64bit IO Format:%lld & %llu Submit Status Practice SCU 4424 Description Time Limit: 1000ms Description Given N distinct elements, how many permutations we can get from all the possible subset of the eleme…

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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…