[BZOJ5351]Query on a sequence 题目大意: 给定一个长度为\(n(n\le10^5)\)的数列\(P\),满足\(|P_i|\le10^9\),求满足下列约束的不同的四元组\((a,b,c,d)\)的个数: \(1\le a\le b<c\le d\le n\): \(b-a=d-c\): \(c-b-1=m\),\(m(m>0)\)为给定的数: \(p_{a+i}=P_{c+i}\)对于所有\(i(0\le i\le b-a)\)均成立. 思路: 对于\(a\)和…

Once again, in this series of posts I look at the parts of the .NET Framework that may seem trivial, but can help improve your code by making it easier to write and maintain. The index of all my past little wonders posts can be found here. We've seen…

Problem Description There's a queue obeying the first in first out rule. Each time you can either push a number into the queue (+i), or pop a number out from the queue (-i). After a series of operation, you get a sequence (e.g. +1 -1 +2 +4 -2 -4). We…

生成SQL语句的功能可以算是LinqToDB框架的最后一步.从上一章中我们可以知道处理完表达式树之后,相关生成SQL信息会被保存在一个叫SelectQuery类的实例.有了这个实例我们就可以生成对应的SQL语句.想要了解这一步部分的功能就必须从三个方面入手.一.Linq To SQL的机制原理.二.如何生成SQL语句.三.设置映射结果. 生成映射表达式 对于Linq To SQL的机制原理在前面的章节里面已经讲过了.这里笔者提出来主要目标是明确什么时候触发.下面的代码不是看前面的获得Query<…

处理表达式树可以说是所有要实现Linq To SQL的重点,同时他也是难点.笔者看完作者在LinqToDB框架里面对于这一部分的设计之后,心里有一点不知所然.由于很多代码没有文字注解.所以笔者只能接合上下代码来推断出作者大概在做什么.但是有些笔者只知道在做什么却很难推断出作者为什么要这么做.这一部分的主要核心类有俩个--Query<T>类和ExpressionBuilder类.可以用一句话来形容:由Query<T>类起也由Query<T>类落. 处理优化表达树 上一章我…

Elven Postman Time Limit: 1500/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 147    Accepted Submission(s): 90 Problem Description Elves are very peculiar creatures. As we all know, they can live for a very…

“查询序列的一个元素” 1. an element of the query sequence (T) 2. an query sequence element (T) "查询序列或者候选序列的一个元素" 1. an element of the query sequence or the candidate sequence (T) 2. an element of the query or candidate sequence (T) 3. an element of the qu…

Time Limit: 1500/1000 MS (Java/Others)   Memory Limit: 131072/131072 K (Java/Others) Problem Description Elves are very peculiar creatures. As we all know, they can live for a very long time and their magical prowess are not something to be taken lig…

Elven Postman Time Limit: 1500/1000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others) Total Submission(s): 880 Accepted Submission(s): 475 Problem Description Elves are very peculiar creatures. As we all know, they can live for a very long…

题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5444 Elven Postman Description Elves are very peculiar creatures. As we all know, they can live for a very long time and their magical prowess are not something to be taken lightly. Also, they live on tr…