unique(b,b n)-b;什么意思

【整理】C++中的unique函数

之前总结了一下我觉得有用的erase,lower_bound,upper_bound. 现在总结一下unique,unique的作用是“去掉”容器中相邻元素的重复元素(不一定要求数组有序),它会把重复的元素添加到容器末尾(所以数组大小并没有改变),而返回值是去重之后的尾地址,下面举个例子. 由于返回的是容器末尾,所以如果想得到去重后的size,需要减去初始地址,lower_bound是得到地址,稍微不同. 如: sz = unique(b + ,b + n + )-(b + ); sz = un

[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

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