[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…
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…
[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…
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…
题目大意:对树进行m次操作,有两类操作,一种是改变一个点的权值(将0变为1,1变为0),另一种为查询以x为根节点的子树点权值之和,开始时所有点权值为1. 分析: 对树进行dfs,将树变为序列,记录每个点进栈出栈的时间戳作为其对应区间的左右端点,那么其子节点对应区间必在该区间内,对这段区间求和即可,用树状数组进行修改与求和. 代码: program apple; type point=^node; node=record x:longint; next:point; end; var a:..]o…
Tree Time Limit: 1000MS Memory Limit: 30000K Total Submissions: 11570 Accepted: 3626 Description Give a tree with n vertices,each edge has a length(positive integer less than 1001). Define dist(u,v)=The min distance between node u and v. Give a…