考虑什么样的串是合法的. 直接考虑比较抽象,考虑具象化这个问题. 容易发现一个字符串的限制就相当于如果出现了其中一个字符 \(a_i = c\),那么 \(s\) 中 \(c\) 前 \(i - 1\) 个字符必然要为:\(a_1 \sim a_{i - 1}\),\(c\) 后的 \(n - i\) 个字符必然要为 \(a_{i + 1} \sim a_n\). 这个限制比较严格,可以放宽为:对于每个在串 \(a\) 中出现过的字符 \(a_i = c\),其前面一个字符必为 \(a_{i -…

2021-10-14 P2577 [ZJOI2004]午餐 2021-10-13 CF815C Karen and Supermarket(小小紫题,可笑可笑) P6748 『MdOI R3』Fallen Lord(sort(a+1,a+1+n,greater<int>()); 真好用) P4161 [SCOI2009]游戏 P1707 刷题比赛 2021-10-12 CF1573A Countdown P2717 寒假作业 P7868 [COCI2015-2016#2] VUDU P1660…

手机客户端向服务器提交Http请求时,Tomcat抛出错误: 十二月 31, 2014 2:32:45 下午 org.apache.coyote.http11.AbstractHttp11Processor process信息: Error parsing HTTP request header Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level. 经过调试后发现是Tomcat…

Toggle Mark Occurrences这个功能非常好用,能把选中的方法/变量在本类中全部出现的地方高亮显示,是一个非常实用的功能.但是默认颜色是灰色,非常毁眼.可以通过下面的设置更改为自己喜欢的颜色. Window->Preferences->General->Editors->Text Editors->Annotations->Occurrences eclipse使用tips-Toggle Mark Occurrences 颜色更改 - xue0224的专…

Count the number of occurrences in a sorted array Given a sorted array arr[] and a number x, write a function that counts the occurrences of x in arr[]. Expected time complexity is O(Logn) Examples: Input: arr[] = {1, 1, 2, 2, 2, 2, 3,}, x = 2 Output…

https://visualstudiogallery.msdn.microsoft.com/ad686131-47d4-4c13-ada2-5b1a9019fb6f About This is a small add-in for Visual Studio 2008. It searches and highlights substrings that are currently selected in a text editor. As a bonus, it works for Outp…

最近写jsp遇到一系列的低级错误,记录下来权当前车之鉴吧. 错误提示: SEVERE: Servlet.service() for servlet jsp threw exceptionorg.apache.jasper.JasperException: /jsp04/Zj04_sj_test1_1.jsp(2,1) Page directive must not have multiple occurrences of pageencoding 程序代码如下: <%@ page languag…

今天进行项目测试的时候出现了further occurrences of HTTP header parsing errors will be logged at DEBUG level.错误,查了半天资料,稍微总结一下: 1.错误报文: 信息: Error parsing HTTP request header Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level. 2.网上查…

严重: Servlet.service() for servlet jsp threw exception org.apache.jasper.JasperException: /jsp.jsp(1,2) Page directive: illegal to have multiple occurrences of contentType with different values (old: text/html; charset=UTF-8, new: text/html; carset=UT…

Description You are given two strings s and t, both consisting only of lowercase Latin letters.The substring s[l..r] is the string which is obtained by taking characters sl,sl+1,…,sr without changing the order.Each of the occurrences of string a in a…