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POJ-3628-Bookshelf 2（枚举+01背包）
Bookshelf 2 题目链接http://poj.org/problem?id=3628 Time Limit: 1000MS Memory Limit: 65536K Description Farmer John recently bought another bookshelf for the cow library, but the shelf is getting filled up quite quickly, and now the only available space is虚拟机一直以来都是学习JAVA编程技术的重点，而今天我们就通过案例分析来了
1.线程计数器，是一块较小的内存空间，用来指定当前线程执行字节码的行数，每个线程计数器都是私有的，因为每个线程都需要记录执行的行数;这里解释一下为什么每个线程都需要一个线程计数器，JVM的多线程是通过线程轮流切换分配执行时间来实现的，在任何时刻，每个处理器都只会执行一个线程中的Day9 - C - Bookshelf 2 POJ - 3628
Farmer John recently bought another bookshelf for the cow library, but the shelf is getting filled up quite quickly, and now the only available space is at the top. FJ has N cows (1 ≤ N ≤ 20) each with some height of Hi (1 ≤ Hi ≤ 1,000,000 - thes