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…

题目 给定一个二维网格和一个单词,找出该单词是否存在于网格中. 单词必须按照字母顺序,通过相邻的单元格内的字母构成,其中"相邻"单元格是那些水平相邻或垂直相邻的单元格.同一个单元格内的字母不允许被重复使用. 示例: board = [ ['A','B','C','E'], ['S','F','C','S'], ['A','D','E','E'] ] 给定 word = "ABCCED", 返回 true. 给定 word = "SEE", 返回…

LeetCode 78 网上已经又很多解这题的博客了,在这只是我自己的解题思路和自己的代码: 先贴上原题: 我的思路: 我做题的喜欢在本子或别处做写几个示例,以此来总结规律:下图就是我从空数组到数组长度为4的示例 在写这些例子的时候,我发现,数组中每增加一个元素,其结果就是前一个结果集(数组长度为n-1的结果)的基础上加上新增的这个元素得到的结果集再加前一个结果集:可能叙述的不清楚我把上面的图片规整下把 例: 规律差不多讲完了,如果还是不清楚请留言,我们一对一解释,现在来贴代码 结果:…

题目描述: 输入正整数n,把整数1,2...n组成一个环,使得相邻两个数和为素数.输出时从整数1开始逆时针排列并且不能重复: 例样输入: 6 例样输出: 1 4 3 2 5 6 1 6 5 2 3 4 方法1:(生成测试法,会超时) #include <bits/stdc++.h> #define MAXN 100 using namespace std; int isp[MAXN], a[MAXN]; void get_prime(void) //*****素数打表 { memset(isp…

Problem 1074: Hey Judge Time Limits:  1000 MS   Memory Limits:  65536 KB 64-bit interger IO format:  %lld   Java class name:  Main   Description Judge Nicole collected 7 ideas for problems of different levels, she wants to create 5 problems for the n…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 42600    Accepted Submission(s): 18885 Problem Description A ring is compose of n circles as shown in diagram. Put natural num…

哈密顿绕行世界问题 Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3105    Accepted Submission(s): 1918 Problem Description 一个规则的实心十二面体,它的 20个顶点标出世界著名的20个城市,你从一个城市出发经过每个城市刚好一次后回到出发的城市.    Input 前20行的第i行…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 34609    Accepted Submission(s): 15327 Problem Description A ring is compose of n circles as shown in diagram. Put natural numb…

Description You are to write a program that tries to find an optimal coloring for a given graph. Colors are applied to the nodes of the graph and the only available colors are black and white. The coloring of the graph is called optimal if a maximum…