IPv6 tutorial – Part 7: Zone ID and unique local IPv6 unicast addresses
The zone ID is used to distinguish ambiguous link-local and site-local addresses. Unique local IPv6 unicast addresses are another way to address the p...
How to fix Column 'InvariantName' is constrained to be unique 解决办法!
IntroductionWhen you build a web project that uses Enterprise Library Community for the Application Data Block and the MySQL .NET / Connector, VisualS...
智能指针unique_ptr的用法
unique_ptr是独占型的智能指针,它不允许其他的智能指针共享其内部的指针,不允许通过赋值将一个unique_ptr赋值给另一个unique_ptr,如下面错误用法: std::unique_ptr<T> myPtr(new T); std::unique_ptr<...
LeetCode之387. First Unique Character in a String
--------------------------------------------------最开始的想法是统计每个字符的出现次数和位置,如下:AC代码:public class Solution { public int firstUniqChar(String s) { ...
96. Unique Binary Search Trees (Tree; DP)
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...
【Mysql】key 、primary key 、unique key 与index区别
参考:https://blog.csdn.net/nanamasuda/article/details/52543177总的来说,primary key 、unique key 这些key建立的同时索引index也就建好了。primary key 和 unique key 都是唯一记录表的一行...
C++11--智能指针shared_ptr,weak_ptr,unique_ptr
共享指针 shared_ptr/*********** Shared_ptr ***********/// 为什么要使用智能指针,直接使用裸指针经常会出现以下情况// 1. 当指针的生命长于所指的资源:野指针// 2. 当指针的生命短于所指的资源:资源泄漏//// 智能指针: 确保指针和资源的生命周...
django.core.exceptions.ImproperlyConfigured: Application labels aren't unique, duplicates: admin
创建了一个Django项目,且包含一个admin的app,但是在启动Django的是时候抛出了以下异常:Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x000...
MySQL-UNIQUE
什么是UNIQUE约束可以使用 UNIQUE 约束确保在非主键列中不输入重复的值。尽管 UNIQUE 约束和 PRIMARY KEY 约束都强制唯一性,但想要强制一列或多列组合(不是主键)的唯一性时应使用 UNIQUE 约束而不是 PRIMARY KEY 约束。可以对一个表定义多个 UNIQUE 约...
Leetcode_96_Unique Binary Search Trees
本文是在学习中的总结,欢迎转载但请注明出处:http://blog.csdn.net/pistolove/article/details/43198929Given n, how many structurally unique BST's (binary search trees) that st...
【题解】【排列组合】【素数】【Leetcode】Unique Paths
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 po...
【LeetCode练习题】Unique Paths
Unique PathsA 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 rig...
[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?Example:Input: 3Output: 5Explanation:Given n = 3, there ar...
SQLServer 中有五种约束, Primary Key 约束、 Foreign Key 约束、 Unique 约束、 Default 约束和 Check 约束
一直在关注软件设计方面,数据库方面就忽略了很多,最近在设计数据库时遇到了一些小麻烦,主要是数据库中约束和性能调优方面的应用,以前在学习 Sql Server 2000,还有后来的 Sql Server 2005 数据库时进行了总结,现在也暴露出了一些问题,由于学习的不深入,有一段时间不使用,就会忘记...
MySql unique的实现原理简析
1、测试过程如下:CREATE TABLE `test` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(100) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `name` (`nam...
leetcode95 Unique Binary Search Trees II
题目: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 a...
pods 报错There may only be up to 1 unique SWIFT_VERSION per target
zhangpengdeMacBook-Pro:Jump zhangpeng$ pod installAnalyzing dependencies[!] There may only be up to 1 unique SWIFT_VERSION per target. Found target(s)...
深入学习jquery源码之merge()和unique()
深入学习jquery源码之merge()概述:合并两个数组到第一个数组上。返回的结果会修改第一个数组的内容——第一个数组的元素后面跟着第二个数组的元素。要去除重复项,请使用$.unique()参数:Array,Arrayfirst,secondfirst:第一个待处理数组,会改变其中的元素。seco...
The Unique MST(次小生成树)
The Unique MST Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a...
leetCode 63.Unique Paths II (唯一路径II) 解题思路和方法
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...