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Deepest Root (25)

[编程题]Deepest Root (25)

热度指数：3016 时间限制：C/C++ 1秒，其他语言2秒空间限制：C/C++ 64M，其他语言128M
算法知识视频讲解

A graph which is connected and acyclic can be considered a tree. The height of the tree depends on the selected root. Now you are supposed to find the root that results in a highest tree. Such a root is called the deepest root .

输入描述:

Each input file contains one test case.  For each case, the first line contains a positive integer N (<=10000) which is the number of nodes, and hence the nodes are numbered from 1 to N.  Then N-1 lines follow, each describes an edge by given the two adjacent nodes' numbers.

输出描述:

For each test case, print each of the deepest roots in a line.  If such a root is not unique, print them in increasing order of their numbers.  In case that the given graph is not a tree, print "Error: K components" where K is the number of connected components in the graph.

示例1