[usaco]4.1.3 Fence Rails 多维背包问题，dfsid
<p> Fence Rails<br>
Burch, Kolstad, and Schrijvers <br>
Farmer John is trying to erect a fence around part of his field. He has decided on the shape of the fence and has even already installed t
RabbitMQ基础概念详解
RabbitMQ简介
AMQP，即Advanced Message Queuing Protocol，高级消息队列协议，是应用层协议的一个开放标准，为面向消息的中间件设计。消息中间件主要用于组件之间的解耦，消息的发送者无需知道消息使用者的存在，反之亦然。
ruby 源码
脚本 rb1021.rb
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1 #!/usr/bin/ruby
2 # ruby code
3
4 class MegaGreeter
5 attr_accessor :n