[ZOJ3626]Treasure Hunt I Time Limit: 2 Seconds      Memory Limit: 65536 KB Akiba is a dangerous country since a bloodsucker living there. Sometimes the bloodsucker will appear and kill everyone who isn't at his hometown. One day, a brave person named…

Treasure Hunt I Time Limit: 2 Seconds      Memory Limit: 65536 KB Akiba is a dangerous country since a bloodsucker living there. Sometimes the bloodsucker will appear and kill everyone who isn't at his hometown. One day, a brave person named CC finds…

本文出自   http://blog.csdn.net/shuangde800 题目链接: zoj-3626 题意 给一棵n个节点的树, 节点编号1~n, 每个节点有权值val[i],经过这个节点就可以获取这个价值(不能重复获得)    每一条边有一个花费值w(i,j), 表示走完i和j点的边要花费w(i,j)    现在要从k点出发,总花费值为m,问总花费不超过m的情况下并且最终要回到出发点,最多可以获取多少价值? 思路 简单树形dp.    f(i,j)表示子树i, 用花费j最多可以获得的价…

E - Treasure Hunt I Time Limit:2000MS Memory Limit:65536KB Description Akiba is a dangerous country since a bloodsucker living there. Sometimes the bloodsucker will appear and kill everyone who isn't at his hometown. One day, a brave person named CC…

树,一种十分优美的数据结构,因为它本身就具有的递归性,所以它和子树见能相互传递很多信息,还因为它作为被限制的图在上面可进行的操作更多,所以各种用于不同地方的树都出现了,二叉树.三叉树.静态搜索树.AVL树,线段树.SPLAY树,后缀树等等.. 枚举那么多种数据结构只是想说树方面的内容相当多,本专辑只针对在树上的动态规划,即树形DP.做树形DP一般步骤是先将树转换为有根树,然后在树上进行深搜操作,从子节点或子树中返回信息层层往上更新至根节点.这里面的关键就是返回的信息部分,这个也没一般性的东西可讲…

转载自 http://blog.csdn.net/woshi250hua/article/details/7644959#t2 题单:http://vjudge.net/contest/123963#overview 树,一种十分优美的数据结构,因为它本身就具有的递归性,所以它和子树见能相互传递很多信息,还因为它作为被限制的图在上面可进行的操作更多,所以各种用于不同地方的树都出现了,二叉树.三叉树.静态搜索树.AVL树,线段树.SPLAY树,后缀树等等.. 枚举那么多种数据结构只是想说树方面的内…

题目 Source http://acm.hdu.edu.cn/showproblem.php?pid=5834 Description Bi Luo is a magic boy, he also has a migic tree, the tree has N nodes , in each node , there is a treasure, it's value is V[i], and for each edge, there is a cost C[i], which means…

题目链接: Magic boy Bi Luo with his excited tree Time Limit: 8000/4000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 1037    Accepted Submission(s): 298 Problem Description Bi Luo is a magic boy, he also has a migic…

  这道题目是十分考验思维的,n^2应该还是比较好想的,主要是如何转移根的问题.转移根,在我看来应该是树形dp最难的一部分了, 一般学会如何转移根,也就差不多考验通吃树形dp了. 下面转一转大佬链接:http://blog.csdn.net/FromATP/article/details/53200240 题解 比较好想的树形DP..但是实现起来很多地方不是一般恶心...也许是ATP的方法太愚蠢了?总之好像当时考试的时候ATP最后半个小时想出来了但是没码完只好写了50pts部分分= =醉死了 那…

Problem Description My name is Hu Bayi, robing an ancient tomb in Tibet. The tomb consists of N rooms (numbered from 1 to N) which are connected by some roads (pass each road should cost some time). There is exactly one route between any two rooms, a…