Apple Tree POJ - 2486 题目大意:一棵点带权有根树,根节点为1.从根节点出发,走k步,求能收集的最大权值和. 树形dp.复杂度可能是O(玄学),不会超过$O(nk^2)$.(反正这题不卡这个,考思想)参考 ans[i][j][0]表示i点以下共走j步,不回来,可能收集到最大的权值ans[i][j][1]表示i点以下共走j步,回来,可能收集到最大的权值 比较复杂的是,每个节点(以下称当前节点)从其子节点转移的时候,需要用一个背包: t[i][j][0]表示当前节点的前i个子节点…

E - Apple Tree POJ - 2486 Wshxzt is a lovely girl. She likes apple very much. One day HX takes her to an apple tree. There are N nodes in the tree. Each node has an amount of apples. Wshxzt starts her happy trip at one node. She can eat up all the ap…

题目链接: D - 树形dp  POJ - 2486 题目大意:一颗树,n个点(1-n),n-1条边,每个点上有一个权值,求从1出发,走V步,最多能遍历到的权值 学习网址:https://blog.csdn.net/Aria461863631/article/details/82356420 具体思路: dp[root][j][0]为从root出发,走j步并且最终回到原来点(中间也有可能回到原来的点,但是会继续往下走)的情况下,回到root节点的权值最大值. dp[root][j][1]为从ro…

There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been carefully nurturing the big apple tree. The tree has N forks which are connected by branches. Kaka numbers…

Apple Tree Description Wshxzt is a lovely girl. She likes apple very much. One day HX takes her to an apple tree. There are N nodes in the tree. Each node has an amount of apples. Wshxzt starts her happy trip at one node. She can eat up all the apple…

[POJ 2486] Apple Tree(树型dp) Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8981   Accepted: 2990 Description Wshxzt is a lovely girl. She likes apple very much. One day HX takes her to an apple tree. There are N nodes in the tree. Each…

好抽象的树形DP......... Apple Tree Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 6411 Accepted: 2097 Description Wshxzt is a lovely girl. She likes apple very much. One day HX takes her to an apple tree. There are N nodes in the tree. Each nod…

Apple Tree Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9808   Accepted: 3260 Description Wshxzt is a lovely girl. She likes apple very much. One day HX takes her to an apple tree. There are N nodes in the tree. Each node has an amoun…

http://poj.org/problem?id=2486 典型的回溯题目:特别是状态方程用三维的来标记是否要走回路. 题意:一颗树,n个点(1-n),n-1条边,每个点上有一个权值,求从1出发,走V步,最多能遍历到的权值 思路: 树形dp,比较经典的一个树形dp.首先很容易就可以想到用dp[root][k]表示以root为根的子树中最多走k时所能获得的最多苹果数,接下去我们很习惯地会想到将k步在root的所有子结点中分配,也就是进行一次背包,就可以得出此时状态的最优解了,但是这里还有一个问题…

id=10486" target="_blank" style="color:blue; text-decoration:none">POJ - 3321 Apple Tree Time Limit: 2000MS   Memory Limit: 65536KB   64bit IO Format: %I64d & %I64u Submit Status Description There is an apple tree outside o…

Apple Tree Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 18623   Accepted: 5629 Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been…

Apple Tree Time Limit: 2000MS   Memory Limit: 65536K       Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been carefully nurturing the big apple t…

Apple Tree Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 25904   Accepted: 7682 Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been…

POJ.3321 Apple Tree ( DFS序 线段树 单点更新 区间求和) 题意分析 卡卡屋前有一株苹果树,每年秋天,树上长了许多苹果.卡卡很喜欢苹果.树上有N个节点,卡卡给他们编号1到N,根的编号永远是1.每个节点上最多结一个苹果.卡卡想要了解某一个子树上一共结了多少苹果. 现在的问题是不断会有新的苹果长出来,卡卡也随时可能摘掉一个苹果吃掉.你能帮助卡卡吗? 前缀技能 边表存储树 DFS时间戳 线段树 首先利用边表将树存储下来,然后DFS打上时间戳.打上时间戳之后,我们就知道书上节点对…

题目链接:http://poj.org/problem?id=3321 Apple Tree Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 34812 Accepted: 10469 Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka like…

Apple Tree Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 21566   Accepted: 6548 Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been…

Apple Tree Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 25232   Accepted: 7503 Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been…

                                                          Apple Tree Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 27470   Accepted: 8140 Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will gr…

Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been carefully nurturing the big apple tree. The tree has N forks which are connected by branches.…

Apple Tree Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 22131   Accepted: 6715 Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been…

Apple Tree Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 26762   Accepted: 7947 Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been…

题目链接 Apple Tree Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 9692 Accepted: 3217 Description Wshxzt is a lovely girl. She likes apple very much. One day HX takes her to an apple tree. There are N nodes in the tree. Each node has an amou…

[poj2486]Apple Tree Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 10800   Accepted: 3629 Description Wshxzt is a lovely girl. She likes apple very much. One day HX takes her to an apple tree. There are N nodes in the tree. Each node ha…

Time Limit: 1000MS   Memory Limit: 65536KB   64bit IO Format: %lld & %llu Description Wshxzt is a lovely girl. She likes apple very much. One day HX takes her to an apple tree. There are N nodes in the tree. Each node has an amount of apples. Wshxzt…

Apple Tree:http://poj.org/problem?id=3321 题意: 告诉你一棵树,每棵树开始每个点上都有一个苹果,有两种操作,一种是计算以x为根的树上有几个苹果,一种是转换x这个点上的苹果,就是有就去掉,没有就加上. 思路: 先对树求一遍dfs序,每个点保存一个l,r.l是最早到这个点的时间戳,r是这个点子树中的最大时间戳,这样就转化为区间问题,可以用树状数组,或线段树维护区间的和. #include <algorithm> #include <iterator&…

http://acm.hust.edu.cn/vjudge/contest/view.action?cid=102419#problem/C Description I’ve bought an orchard and decide to plant some apple trees on it. The orchard seems like an N * M two-dimensional map. In each grid, I can either plant an apple tree…

Let's imagine how apple tree looks in binary computer world. You're right, it looks just like a binary tree, i.e. any biparous branch splits up to exactly two new branches. We will enumerate by integers the root of binary apple tree, points of branch…

Apple Tree Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 16180   Accepted: 4836 Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been…

Apple Tree Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 20335   Accepted: 6182 Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been…

http://acm.hdu.edu.cn/showproblem.php?pid=4925 Apple Tree Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 120    Accepted Submission(s): 82 Problem Description I’ve bought an orchard and decid…