Lowest Common Ancestor问题的解决思路
对于Off-Line的Lowest Common Ancestor问题,问题描述如下:
we are given a rooted tree T and an arbitrary set P{(u,v),...} of unordered pairs of nodes in T , and we wish to deter-
mine the least common ancestor of each pair in P .
解决该问题有一个大名鼎鼎的方法 Tarjan’s off-line least-common-ancestors algorithm ,其中用到了disjoint set,算法如下:
To solve the off-line least-common-ancestors problem, the following procedure performs a tree walk of T with the initial call LCA(T.root). We assume that each node is colored WHITE prior to the walk.
LCA(u)
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