Missing Number-[回溯][难]
2. Missing number 转自:https://mp.weixin.qq.com/s/WLRXLdi-3igkjtiWlHg7Ug
Given a positive integer n(n≤40), pick n-1 numbers randomly from 1 to n and concatenate them in random order as a string s, which means there is a missing number between 1 and n. Can you find the missing number?(Notice that in some cases the answer will not be unique, and in these cases you only need to find one valid answer.)
Examples:
Input: 20
81971112205101569183132414117
Output: 16
//使用回溯法,这是我不太会,明天看一下。
Missing Number-[回溯][难]的更多相关文章
- Leetcode-268 Missing Number
#268. Missing Number Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find ...
- Missing number
Missing number 题目: Description There is a permutation without two numbers in it, and now you know wh ...
- 【LeetCode】268. Missing Number
Missing Number Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one ...
- hdu 5166 Missing number
题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5166 Missing number Description There is a permutatio ...
- Missing Number, First Missing Positive
268. Missing Number Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find th ...
- HDU 5166 Missing number 简单数论
Missing number Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others) [ ...
- Missing number in array
Given an array of size n-1 and given that there are numbers from 1 to n with one missing, the missin ...
- PAT 1144 The Missing Number
1144 The Missing Number (20 分) Given N integers, you are supposed to find the smallest positive in ...
- [LintCode] Find the Missing Number 寻找丢失的数字
Given an array contains N numbers of 0 .. N, find which number doesn't exist in the array. Example G ...
- PAT 1144 The Missing Number[简单]
1144 The Missing Number(20 分) Given N integers, you are supposed to find the smallest positive integ ...
随机推荐
- fork函数和vfork函数的区别--19
fork()与vfock()都是创建一个进程,那他们有什么区别呢?总结有以下三点区别: 1. fork ():子进程拷贝父进程的数据段,代码段 vfork ( ):子进程与父进程共享数据段 ...
- Java精选笔记_JavaBean
JavaBean组件 初始JavaBean JavaBean是Java开发语言中一个可以重复使用的软件组件,它本质上就是一个Java类. 一个标准的JavaBean组件需要遵循一定的编码规范,具体如下 ...
- python2.0_s12_day9_mysql操作
mysql的基本语法: 1.数据库操作 show databases; create database 数据库名;如果想允许数据库可以写中文create database 数据库名 charset u ...
- mysql 中实现行变列
前言: mysql行列变化,最难的就是将多个列变成多行,使用的比较多的是统计学中行变列,列变行,没有找到现成的函数或者语句,所以自己写了存储过程,使用动态sql来实现,应用业务场景,用户每个月都有使用 ...
- laravel 控制器多个方法共用一个路由
直接上代码: Route::get('Index/{action}', function(App\Http\Controllers\IndexController $index, $action){ ...
- ch6-定制数据对象(打包代码和数据)
为了看出数据属于哪个选手,教练向各个选手的数据文件中添加了标识数据:选手全名,出生日期,计时数据. 例如:sarah文件的数据更新为: Sarah Sweeney,2002-6-17,2:58,2.5 ...
- ch4-持久存储
1.处理数据和打印 man = [] other = [] try: data = open('sketch.txt') for each_line in data: try: (role, line ...
- C#正则表达式提取HTML中IMG标签中的SRC地址
百度到的一个,这里就直接贴了 http://blog.csdn.net/smeller/article/details/7108502#comments 一般来说一个 HTML 文档有很多标签,比如“ ...
- Ajax轮询——定时的通过Ajax查询服务端
概念:轮询(polling):客户端按规定时间定时向服务端发送ajax请求,服务器接到请求后马上返回响应信息并关闭连接. test.html //前端代码 <html> <h ...
- 设计模式-UML类图基础
设计模式之序-UML类图那点事儿 打14年年底就像写那么一个系列,用于讲设计模式的,代码基于JAVA语言,最早接触设计模式是大一还是大二来着,那时候网上有人给推荐书,其中就有设计模式,当时给我推荐的书 ...