一个公司的职员是分级制度的,所有员工刚好是一个树形结构,现在公司要举办一个聚会,邀请部分职员来参加. 要求: 1.为了聚会有趣,若邀请了一个职员,则该职员的直接上级(即父节点)和直接下级(即儿子节点)都不能被邀请 2.每一个员工都有一个兴奋值,在满足1的条件下,要使得邀请来的员工的兴奋值最高 输出最高的兴奋值. 简单的树形DP dp[i][1]:表示以i为根的子树,邀请节点i的最大兴奋值 dp[i][0]:表示以i为根的子树,不邀请节点i的最大兴奋值 先根据入度找出整棵树的根节点, 然后一次DF…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1520 题目大意:给出n个带权点,他们的关系可以构成一棵树,问从中选出若干个不相邻的点可能得到的最大值为多少 解题思路:简单的树形DP 用dp[i][0]表示以i为根的树上不取i的状态下能得到的最大值 用dp[i][1]表示以i为根的树取i的状态下能得到的最大值 状态转移方程 dp[i][0]=∑(max(dp[son(i)][0],dp[son(i)][1])) dp[i][1]=∑(dp[son(…

Anniversary party Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 6990    Accepted Submission(s): 3104 Problem Description There is going to be a party to celebrate the 80-th Anniversary of the…

POJ 2342 Anniversary party / HDU 1520 Anniversary party / URAL 1039 Anniversary party(树型动态规划) Description There is going to be a party to celebrate the 80-th Anniversary of the Ural State University. The University has a hierarchical structure of emp…

/*poj 2324 Anniversary party(树形DP) ---用dp[i][1]表示以i为根的子树节点i要去的最大欢乐值,用dp[i][0]表示以i为根节点的子树i不去时的最大欢乐值, ---于是当i去时,i的所有儿子都不能去:dp[i][1]=sum(dp[j][0])+a[i],其中j是i的儿子节点. ---当i不去时,i的儿子可去也可不去:dp[i][0]=sum(max(dp[j][0],dp[j][1])),j是i的儿子节点 ---边界条件:当i时叶子节点时,dp[i][…

Anniversary party Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 12770    Accepted Submission(s): 5142 Problem Description There is going to be a party to celebrate the 80-th Anniversary of the…

传送门: http://acm.hdu.edu.cn/showproblem.php?pid=1520 Anniversary party Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 16376    Accepted Submission(s): 6241 Problem Description There is going to…

Problem Description There is going to be a party to celebrate the 80-th Anniversary of the Ural State University. The University has a hierarchical structure of employees. It means that the supervisor relation forms a tree rooted at the rector V. E.…

Anniversary party Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 8667    Accepted Submission(s): 3748 Problem Description There is going to be a party to celebrate the 80-th Anniversary of the…

Anniversary party Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 3623    Accepted Submission(s): 1684 Problem Description There is going to be a party to celebrate the 80-th Anniversary of the…