容斥原理 A Number Sequence 题意:给出n个数,b1,b2,b3……bn,构造n个数,a1,a2,……an(ai>1),使得a1*a2*a3……an=b1*b2……bn 分析:容易想到的是将bi分解质因数,然后记录每个质因数的个数.那么题目变成:对于(每个质因数个数为m个划分到n个不同的容器的方案数),注意ai>1,所以没有某个数没有质因数.记f(n)为n个数字可能有1的方案数,g(n)为n个数字一定没有1的方案数.则,得到听说这是二项式反演? #include <bit…
我的maven 项目有一个红色感叹号, 而且Problems 存在 errors : Description Resource Path Location Type Archive for required library: 'D:/mvn/repos/junit/junit/3.8.1/junit-3.8.1.jar' in project 'xxx' cannot be read or is not a valid ZIP file ktb-mgr Maven Webapp Build pa…
今日在写GenericDao时,发现了一个异常,内容如下: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'genericDao' defined in class path resource [spring.common.xml]: Invocation of init method failed; nested exception is java.lang.Ille…
原文链接:http://rxxluowei.iteye.com/blog/671893 今天写第一次写JavaFX的入门程序就GG 遇到了导入API的问题,无奈疯狂地通过网络找解决方案.. 我的问题是: 导入import javafx.application.Application;时 出现这个错误提示 Access restriction: The type 'Application' is not API (restriction on required library 'C:\Progra…
真机测试的时候弹出这样的提示:The certificate used to sign ***has either expired or has been revoked. An updated certificate is required to sign and install the application.... 想了想自己清理过本地的证书,于是参照 stackoverflow 上的方法试了下,果然好了.具体流程如下: Shift(⇧) + Command(⌘) + K 或者 Produ…
java.lang.IllegalArgumentException: 'sessionFactory' or 'hibernateTemplate' is required 严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListenerorg.springframework.beans.facto…
Required attribute can be applied to a property of a domain class. EF Code-First will create a NOT NULL column in a database table for a property on which we apply Required attribute. Note that it can also be used with ASP.Net MVC as a validation att…
最近遇到一起关于"I/O is frozen on database xxx. No user action is required. However, if I/O is not resumed promptly, you could cancel the backup."的案例. 出现问题的时候,我去执行一个非常简单的SQL语句,执行时间非常长,检查没有阻塞.正常情况下,应该是几秒就OK.后面检查错误日志,发现有大量这类消息.而这个点,我们没有备份数据库的作业.后面搜索,了解了一下…
Intel HAXM is required to run this AVD,VT-x is disabled in BIOS;Enable VT-x in your BIOS security settings (refer to documentation for your computer) . 意思是让进入你的BIOS系统中将BIOS中的VT-x 给开启了. 解决方案:重启电脑.按F10 (惠普电脑) 然后进入到BIOS中. 选择 系统设置 -> 处理器虚拟化技术 将这个选项开启 .…
安装第三方库出现 Python version 2.7 required, which was not found in the registry 建立一个文件 register.py 内容如下. 然后执行该脚本. import sys from _winreg import * # tweak as necessary version = sys.version[:3] installpath = sys.prefix regpath = "SOFTWARE\\Python\\Pythonco…
在Eclipse中编写Java代码时,用到了BASE64Decoder,import sun.misc.BASE64Decoder;可是Eclipse提示:Access restriction : The type BASE64Decoder is not accessible due to restriction on required library C:\Programfiles\java\jre6\lib\rt.jarAccess restriction : The constructo…
由于我安装Python64位的,下载后没注册,安装Twisted时老提示“python version 2.7 required,which was not found in the registry”错误 解决方法 1.任意位置存放reg.py文件 # # script to register Python 2.0 or later for use with win32all # and other extensions that require Python registry setting…
The type * is not accessible due to restriction on required library”的错误, 意思是所需要的类库由于受限制无法访问. 解决办法: 1.选中项目->右键->进入Properties视图,选中Java Build Path->点击Libraries->展开JRE System Library[JavaSE-1.6],选中Access rules这一项.如图: 2.Edit->点击Add->在Rule Pat…
WCF Proxy Authentication Required The Problem When I’m in the office, I have to use an authenticated proxy to get outside our intranet and to the internet. When I called a service that resides on the web, I got the 407 error. How can we fix this with…
1.错误描述:今天在起归档的时候报一下错误: SQL> alter database archivelog; alter database archivelog * ERROR at line : ORA: instance recovery required, cannot set ARCHIVELOG mode 2.从错误上看到是由于三大文件(datafile,controlfile,logfile)的scn不一致导致,造成scn不一致的原因是我们用了shutdown abort(shutd…
升级到macos sierra xcode8 报提示:requires additional components to support runing and debugging choose Install to add required components 当你遇到这个情况的时候,不要慌.你就是上网搜索也不会有什么好结果的. 本人真实经历该错误,,一小时多解决.该错误的解决可以为开发工程师节省一个小时时间. 亲爱的主耶稣,愿你保守我们. 原因:系统安装完毕自己打开并未重启,须再次重启才能使…
~~~~~~~~~~~My problem is here~~~~~~~~~~~~~~~~~~~~~~ Error: Microsoft visual C++ 10.0 is required (unable to find vcvarsall.bat) %VS110COMNTOOLS%部分python的code在setup中存在的问题:找不到C++compiler vcvarsall.bat 不要完全相信所谓的解除bug的神器stackoverflow中给出的答案 http://stackov…
springMVC action接收参数: org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errorsField error in object 'projectStep' on field 'createDate': rejected value [2016-6-23]; codes [typeMismatch.projectSt…
