G-Howe的博客

题意是找一个数做了几个数的祖先（做了多少次祖先） Write a program that takes as input a rooted tree and a list of pairs of vertices. For each pair (u,v) the program determines the closest common ancestor of u and v in the tr...

刚开始学，不知道该怎麽写，照着师哥代码敲的，当做模板吧 A rooted tree is a well-known data structure in computer science and engineering. An example is shown below: In the figure, each node is labeled with an integer from {1, 2...

算法简介 另一种理解方式是把T理解为一个无向无环图，而LCA(T,u,v)即u到v的最短路上深度最小的点。 这里给出一个LCA的例子： 对于T=<V,E> V={1,2,3,4,5} E={(1,2),(1,3),(3,4),(3,5)} 则有： LCA(T,5,2)=1 LCA(T,3,4)=3 LCA(T,4,5)=3 算法 编辑 离线算法 Tarj...