题目链接:http://www.lightoj.com/volume_showproblem.php?problem=1257 跟hdu2196一样,两次dfs //#pragma comment(linker, "/STACK:102400000, 102400000") #include <algorithm> #include <iostream> #include <cstdlib> #include <cstring> #inc…

1094 - Farthest Nodes in a Tree problem=1094" style="color:rgb(79,107,114)"> problem=1094&language=english&type=pdf" style="color:rgb(79,107,114)">PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Li…

1094 - Farthest Nodes in a Tree PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB Given a tree (a connected graph with no cycles), you have to find the farthest nodes in the tree. The edges of the tree are weighted and undire…

http://acm.hust.edu.cn/vjudge/contest/121398#problem/H 不是特别理解,今天第一次碰到这种问题.给个链接看大神的解释吧 http://www.cnblogs.com/qq2424260747/p/4740347.html #include <cstdio> #include <cstring> #include <iostream> #include <cmath> #include<vector&g…

题目给一棵树,边带有权值,求每一点到其他点路径上的最大权和. 树上任意两点的路径都可以看成是经过某棵子树根的路径,即路径权=两个点到根路径权的和,于是果断树分治. 对于每次分治的子树,计算其所有结点到根的距离:对于每个结点,找到另一个离根最远的且与该结点路径过根的结点,二者的距离和就是这个点在过这棵子树的根能到的最远距离. 现在问题就是怎么比较快地找到这另一个最远距离的点..两点路径过根,说明两点间不存在一点是另一点的祖先..我一开始还想用DFS序+线段树来着..想了想,想出了线性的算法: 记录…

题目链接:http://lightoj.com/volume_showproblem.php?problem=1094 Given a tree (a connected graph with no cycles), you have to find the farthest nodes in the tree. The edges of the tree are weighted and undirected. That means you have to find two nodes in…

题目链接,密码:hpu Description Given a tree (a connected graph with no cycles), you have to find the farthest nodes in the tree. The edges of the tree are weighted and undirected. That means you have to find two nodes in the tree whose distance is maximum a…

http://lightoj.com/volume_showproblem.php?problem=1094 Given a tree (a connected graph with no cycles), you have to find the farthest nodes in the tree. The edges of the tree are weighted and undirected. That means you have to find two nodes in the t…

1094 - Farthest Nodes in a Tree   PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB Given a tree (a connected graph with no cycles), you have to find the farthest nodes in the tree. The edges of the tree are weighted and undi…

Given a tree (a connected graph with no cycles), you have to find the farthest nodes in the tree. The edges of the tree are weighted and undirected. That means you have to find two nodes in the tree whose distance is maximum amongst all nodes. Input…