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): 12770    Accepted Submission(s): 5142 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) 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…

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…

A - 树形dp Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status 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…

The more, The Better Time Limit: 6000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4859    Accepted Submission(s): 2864 Problem Description ACboy很喜欢玩一种战略游戏,在一个地图上,有N座城堡,每座城堡都有一定的宝物,在每次游戏中ACboy允许攻克M个城堡并获得里面的宝…

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…

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(…

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): 6078    Accepted Submission(s): 2752 Problem Description There is going to be a party to celebrate the 80-th Anniversary of the…

CGZ大佬提醒我,我要是再不更博客可就连一月一更的频率也没有了... emmm,正好做了一道有点意思的题,就拿出来充数吧=.= 题意 一棵树,有 $ n (n\leq50000) $ 个节点,每个点都有一个颜色,共有 $ k(k\leq10) $ 种颜色,问有多少条路径可以遍历到所有 $ k $ 种颜色?(一条路径交换起点终点就算两条哦) 做法 事实证明,连我都能不看题解想出来的题果然都是水题qwq 我是从CJ的xzyxzy大佬上的博客上看到这道题的,所以就理所当然用FWT做了...然后才发现网…

http://acm.split.hdu.edu.cn/showproblem.php?pid=3586 题意: 给定一个带权无向树,要切断所有叶子节点和1号节点(总根)的联系,每次切断边的费用不能超过上限limit,问在保证总费用<=m下的最小的limit. 思路: 对于上限limit我们可以二分查找.然后就是树形dp,看代码就可以理解的. #include<iostream> #include<algorithm> #include<cstring> #inc…

zxa and leaf 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5682 Description zxa have an unrooted tree with n nodes, including (n−1) undirected edges, whose nodes are numbered from 1 to n. The degree of each node is defined as the number of the edge…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=6201 题意:给出一棵树,每个点有一个权值,代表商品的售价,树上每一条边上也有一个权值,代表从这条边经过所需要的花费.现在需要你在树上选择两个点,一个作为买入商品的点,一个作为卖出商品的点,当然需要考虑从买入点到卖出点经过边的花费.使得收益最大.允许买入点和卖出点重合,即收益最小值为0. 解法:我们设1为根节点,假设一开始一个人身上的钱为0.我们设dp[i][0]表示从根节点走到i及其子树并中任一点买…

HDU 2412 和poj 2342(hdu 1520)差不多,多了一个判断最优解是(Yes)否(No)唯一.关键问题也在这个判断最优解是否唯一上. 先定义dp[u][2],表示选(dp[][1])或不选(dp[][0])当前节点u所获得的最大值. 对于叶子节点  :dp[u][0]=0,dp[u][1]=1; 对于非叶子节点:dp[u][0]=Σmax(dp[v][0],dp[v][1])(v是u的儿子节点) dp[u][1]+=Σdp[j][0] 最大值答案即为:max(dp[1][0],d…

Warm up Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others) Total Submission(s): 3160    Accepted Submission(s): 718 Problem Description N planets are connected by M bidirectional channels that allow instant transport…

题目链接:http://acm.hust.edu.cn/vjudge/contest/view.action?cid=106048#problem/B 题意:给出一些点相连,找出最小的点数覆盖所有的 用树形dp来解决 dp[i][0]表示i点不选,dp[i][1]表示i点选,dp[i][0] = sum{ dp[ son[i] ][1] }, // i不选,则i的子节点全选, dp[i][1] = sum { min( dp[ son[i] ][0], dp[ son[i] ][1] ) } +…

transaction transaction transaction Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 132768/132768 K (Java/Others)Total Submission(s): 895    Accepted Submission(s): 441 Problem Description Kelukin is a businessman. Every day, he travels aroun…

Anniversary party Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 6926   Accepted: 3985 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…

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.…

题目描述 某大学有N个职员,编号为1~N.他们之间有从属关系,也就是说他们的关系就像一棵以校长为根的树,父结点就是子结点的直接上司.现在有个周年庆宴会,宴会每邀请来一个职员都会增加一定的快乐指数Ri,但是呢,如果某个职员的上司来参加舞会了,那么这个职员就无论如何也不肯来参加舞会了.所以,请你编程计算,邀请哪些职员可以使快乐指数最大,求最大的快乐指数. 输入输出格式 输入格式: 第一行一个整数N.(1<=N<=6000) 接下来N行,第i+1行表示i号职员的快乐指数Ri.(-128<=Ri…

题意:给一棵树,每个节点都有权值,要求选择部分节点出来,使得权值之和最大,但是每对(父亲,儿子)中最多只能挑一个. 思路: 比较入门的题,每个节点可以选也可以不选.若当前节点选的话,孩子必须全部不选:若当前节点不选,则孩子可以选也可以不选. #include <bits/stdc++.h> #define pii pair<int,int> #define INF 0x3f3f3f3f #define LL long long using namespace std; ; ], p…

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 6058    Accepted Submission(s): 2743 Problem Description There is going to be a party to celebrate the 80-th Anniversary of the Ural State Univers…

题意:就是给定两个字符串,第一个是初始串,第二个是目标串,问你把初始串变到目标串最少需要多少串! 分析:此题分两步,第一步是假设开始的初始串是空串,然后就进行区间dp,dp[i][j]代表把区间[i,j]变到与目标串相同的时候最少需要的步数,所以可以初始化dp[i][j]=dp[i+1][j]+1; 然后如果str2[i]==str2[k]就可以有dp[i][j]=min(dp[i][j],dp[i+1][k]+dp[k+1][j]).具体看代码实现吧! 代码实现: #include<iostr…

HDU 1561  The more, The Better 题目大意就不说了 直接DP[i][j]表示i为跟节点的子树上攻克j个城堡的所能获得的最多宝物的数量 DP[fa][j] = MAX{DP[fa][i-k] + DP[child][k]}; 首先一个问题就是说如果子树u下的任意子节点被选择了,那么u是一定需要选择的,怎么在DP时保证准确性,其实这个很好解决,我们在计算时是需要枚举k(子节点的攻克数量)的,那么我们迫使k<j就可以了,这样的话DP[fa][j] 就不会被子节点的DP[ch…

Big binary tree Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 597    Accepted Submission(s): 207 Problem Description You are given a complete binary tree with n nodes. The root node is numbere…

[题目链接] http://acm.hdu.edu.cn/showproblem.php?pid=5909 [题目大意] 给出一棵树,其每棵连通子树的价值为其点权的xor和, 问有多少连通子树的价值为1~m [题解] 首先定1为根,转有根树,我们在树的每个节点保存一个权值数组, 表示与其连通的子树的权值,当一个子树并入其父节点时, dp[x][i]=dp[x][i]+dp[x][j]*dp[y][k](j^k==i),我们发现这是一个位运算卷积式子, 所以树上转移可以用fwt加速. [代码] #…

transaction transaction transaction Kelukin is a businessman. Every day, he travels around cities to do some business. On August 17th, in memory of a great man, citizens will read a book named "the Man Who Changed China". Of course, Kelukin woul…

Time limit :1000 ms :Memory limit :32768 kB: OS :Windows 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 for…