题目链接：http://poj.org/problem?id=1873 大意：有一片N棵树的森林，要从中砍掉几棵树做成篱笆，把剩下的树围起来 输入：给N课树，每棵树的坐标是x,y，每棵树有一个vi和li分别代表砍掉这棵树的花费和砍掉后可做成篱笆的长度 输出：被砍掉树的编号（从1开始）、把剩下的树围起来后剩下的篱笆米数。 思路：暴力枚举..用01表示哪些树被砍了，维护一个可行的最小值，

Once upon a time, in a faraway land, there lived a king. This king owned a small collection of rare and valuable trees, which had been gathered by his ancestors on their travels. To protect his trees