C++ unique - 相关文章

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[LeetCode] Unique Substrings in Wraparound String 封装字符串中的独特子字符串

Consider the string s to be the infinite wraparound string of "abcdefghijklmnopqrstuvwxyz", so s will look like this: "...zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcd....". Now we have another string p. Your job is to find…

[LeetCode] Minimum Unique Word Abbreviation 最短的独一无二的单词缩写

A string such as "word" contains the following abbreviations: ["word", "1ord", "w1rd", "wo1d", "wor1", "2rd", "w2d", "wo2", "1o1d", "1or1", "…

[LeetCode] Count Numbers with Unique Digits 计算各位不相同的数字个数

Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example: Given n = 2, return 91. (The answer should be the total numbers in the range of 0 ≤ x < 100, excluding [11,22,33,44,55,66,77,88,99]) Hint: A direct…

[LeetCode] Unique Word Abbreviation 独特的单词缩写

An abbreviation of a word follows the form <first letter><number><last letter>. Below are some examples of word abbreviations: a) it --> it (no abbreviation) 1 b) d|o|g --> d1g 1 1 1 1---5----0----5--8 c) i|nternationalizatio|n --&…

[LeetCode] Unique Binary Search Trees 独一无二的二叉搜索树

Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example,Given n = 3, there are a total of 5 unique BST's. 1 3 3 2 1 \ / / / \ \ 3 2 1 1 3 2 / / \ \ 2 1 2 3 这道题实际上是Catalan Number卡塔兰数的一个例子,如果对卡塔兰数不熟悉的童鞋可能真…

[LeetCode] Unique Binary Search Trees II 独一无二的二叉搜索树之二

Given n, generate all structurally unique BST's (binary search trees) that store values 1...n. For example,Given n = 3, your program should return all 5 unique BST's shown below. 1 3 3 2 1 \ / / / \ \ 3 2 1 1 3 2 / / \ \ 2 1 2 3 confused what "{1,#,2…

[LeetCode] Unique Paths II 不同的路径之二

Follow up for "Unique Paths": Now consider if some obstacles are added to the grids. How many unique paths would there be? An obstacle and empty space is marked as 1 and 0 respectively in the grid. For example, There is one obstacle in the middl…

[LeetCode] Unique Paths 不同的路径

A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any point in time. The robot is trying to reach the bottom-right corner of the grid (marked 'Finish' in t…

2 Unique Binary Search Trees II_Leetcode

Given n, generate all structurally unique BST's (binary search trees) that store values 1...n. For example, Given n = 3, your program should return all 5 unique BST's shown below. 1 3 3 2 1 \ …

Constraint5：unique 约束和null

unique约束使用unique index来限制列值的唯一性: 创建unique约束之后,column中允许插入null值,unique 约束将两个null值看作是相同的(即null=null为true),null和其他任何非null值都不相等. 一,unique约束分为column level和table level,区别在于Table Level需要制定unique约束影响的column(or columns). Column level的unique 约束语法 column_name <…

jQuery.unique引发一个血案

项目开发过程中,PM说系统只要在一个特定的浏览器中运行就好,但是在其他的浏览器中不能出现逻辑的错误,所以在开发过程中,前端和后台选择是Chrome浏览器,没有仔细测试Firefox和IE.但是昨天PM反映了一个bug,是浏览器兼容性bug,在Chrome浏览器下工作正常,但是在IE浏览器不报错,但是逻辑是不对的.剔除复杂的业务逻辑,代码精简如下: <html> <head> <meta charset="utf-8"/> <script typ…

Differences between INDEX, PRIMARY, UNIQUE, FULLTEXT in MySQL?

487down vote Differences KEY or INDEX refers to a normal non-unique index. Non-distinct values for the index are allowed, so the index may contain rows with identical values in all columns of the index. These indexes don't enforce any restraints on…

ORA-02266: unique/primary keys in table referenced by enabled foreign keys

在数据库里面使用TRUNCATE命令截断一个表的数据时,遇到如下错误 SQL >TRUNCATE TABLE ESCMOWNER.SUBX_ITEM ORA-02266: unique/primary keys in table referenced by enabled foreign keys 有时候对应的中文错误提示为:ORA-02266: 表中的唯一/主键被启用的外部关键字引用,一般出现这个错误,是因为表中的主键被其它表的外键所引用,导致删除数据时出错. 此时,你可以通过下面脚本查看一下…

ORA-02429: cannot drop index used for enforcement of unique /primary key

相信不少人遇到过ORA-02429: cannot drop index used for enforcement of unique /primary key 这个错误,对应的中文提示"ORA-02429: 无法删除用于强制唯一/主键的索引",其实从错误提示信息已经很明显了.下面还是用一个简单的例子述说一下该错误的来龙去脉. ORA-02429错误的原因是因为用户试图删除一个用于强制唯一/主键的索引,解决方法也很简单,删除对应的约束就会自动删除该索引. [oracle@DB-Serv…

Replication-Replication Distribution Subsystem: agent xxxxxx failed. Column names in each table must be unique

最近遇到一个关于发布订阅(Replication)的奇葩问题,特此记录一下这个案例.我们一SQL SERVER数据库服务器出现大量告警.告警信息如下所示: DESCRIPTION: Replication-Replication Distribution Subsystem: agent xxxxxx failed. Column names in each table must be unique. Column name 'xxxxx' in table 'dbo.xxxxxx' is sp…

POJ1679 The Unique MST[次小生成树]

The Unique MST Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 28673 Accepted: 10239 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undir…

jquery 里面对数组去重操作-unique

js: var yearArray = new Array(2009, 2009, 2010, 2010, 2009, 2010); $.unique(yearArray); alert(yearArray);//2009,2010,2009,2010 需要先排序: var yearArray = new Array(2009, 2009, 2010, 2010, 2009, 2010); $.unique(yearArray<strong>.sort()</strong>); a…

[CareerCup] 1.1 Unique Characters of a String 字符串中不同的字符

1.1 Implement an algorithm to determine if a string has all unique characters. What if you cannot use additional data structure? 这道题让我们判断一个字符串中是否有重复的字符,要求不用特殊的数据结构,这里应该是指哈希表之类的不让用.像普通的整型数组应该还是能用的,这道题的小技巧就是用整型数组来代替哈希表,在之前Bitwise AND of Numbers Range 数…

Mysql索引PRIMARY、NORMAL、UNIQUE、FULLTEXT 区别和使用场合

索引数据库的索引就像一本书的目录,能够加快数据库的查询速度. MYSQL索引有四种PRIMARY.INDEX.UNIQUE.FULLTEXT, 其中PRIMARY.INDEX.UNIQUE是一类,FULLTEXT是一类. 这四种都是单列索引,也就是他们都是作用于单个一列,所以也称单列索引:但是所以一个索引也可以作用于多个列上,称为组合索引或复合索引. 单列索引新建一张测试表 ) NOT NULL); (1)PRIMARY:主键索引.索引列唯一且不能为空:一张表只能有一个主键索引(主键索引通常…

【leetcode】Unique Binary Search Trees (#96)

Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example, given n = 3, there are a total of 5 unique BST's. 1 3 3 2 1 \ / / / \ \ 3 2 1 1 …

Leetcode Unique Paths II

Follow up for "Unique Paths": Now consider if some obstacles are added to the grids. How many unique paths would there be? An obstacle and empty space is marked as 1 and 0 respectively in the grid. For example, There is one obstacle in the middl…

SQL CREATE TABLE 语句\SQL 约束 (Constraints)\SQL NOT NULL 约束\SQL UNIQUE 约束

CREATE TABLE 语句 CREATE TABLE 语句用于创建数据库中的表. SQL CREATE TABLE 语法 CREATE TABLE 表名称 ( 列名称1 数据类型, 列名称2 数据类型, 列名称3 数据类型, .... ) 数据类型(data_type)规定了列可容纳何种数据类型.下面的表格包含了SQL中最常用的数据类型: 数据类型描述 integer(size) int(size) smallint(size) tinyint(size) 仅容纳整数.在括号内规定数字的最…

MySql unique的实现原理简析

1.测试过程如下: CREATE TABLE `test` ( `id` ) NOT NULL AUTO_INCREMENT, `name` ) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `name` (`name`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 事务1: 事务2:mysql> select * from test; +----+-------+ | id | name | +----+-------+…