Farmer John has a farm. Betsy, a famous cow, loves running in farmer John's land. The noise she made makes John mad. So he wants to restrict the area Betsy can run. There are nn (4<n\le 20000004<n≤2000000) points of interest (or POI) on the farm, th…

畅通工程 Problem Description 某省调查城镇交通状况,得到现有城镇道路统计表,表中列出了每条道路直接连通的城镇.省政府"畅通工程"的目标是使全省任何两个城镇间都可以实现交通(但不一定有直接的道路相连,只要互相间接通过道路可达即可).问最少还需要建设多少条道路?    Input 测试输入包含若干测试用例.每个测试用例的第1行给出两个正整数,分别是城镇数目N ( < 1000 )和道路数目M:随后的M行对应M条道路,每行给出一对正整数,分别是该条道路直接连通的两个…

Description Give you a number S of length n,you can choose a position and remove the number on it.After that,you will get a new number. More formally,you choose a number x(1<=x<=n),then you will get the number Rx=S1S2…..Sx-1 Sx+1……Sn..The problem is…

Description          Cyy likes something symmetrical, and Han Move likes something circular. Han Move gave you a circular string whose length is N, i.e. the i-th character of the string is the neighbor of the ( (i-1) mod N )-th character and ( (i+1)…

Description Today, the math teacher taught Alice Hui Yang’s triangle. However, the teacher came up with a new one, called Sama’s triangle (some of you may be familiar with this name).        In this triangle, there is only 30 row, and the ith row has…

Description Old Sama is a great and powerful magician in the word. One day, a little girl, Anny, touched Sama’s crystal and broke into his magic 2D space. However, Sama is very amiable. So he wanted to send Anny back to the real world instead of trap…

题目 1619: [Usaco2008 Nov]Guarding the Farm 保卫牧场 Time Limit: 5 Sec  Memory Limit: 64 MB Submit: 491  Solved: 218 [Submit][Status] Description The farm has many hills upon which Farmer John would like to place guards to ensure the safety of his valuable…

搭建 OJ 需要的知识(重要性排序): Java SE(Basic Knowledge, String, FileWriter, JavaCompiler, URLClassLoader, SecurityManager, synchronized) Java Virutal Machine(Classpath,Policy) Servlet(HttpServlet) JSP(Session, JSP, EL, JSTL, Custom Tags) Tomcat(Classpath) Java…

使用Visual Studio 2013创建一个可视web 部件,当右击项目选择"部署"时报错: "Error occurred in deployment step 'Add Solution': A feature with ID 15/3e472a61-bbc9-4242-87c7-a07e8e3fab99 has already been installed in this farm. Use the force attribute to explicitly re-…

1Z0-053 争议题目解析706 考试科目:1Z0-053 题库版本:V13.02 题库中原题为: 706.You execute the following command to set the redundancy retention policy in Recovery Manager (RMAN): RMAN>CONFIGURE RETENTION POLICY TO REDUNDANCY 3; Identify the statement that correctly describ…