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On-Line Ranking Algorithms for Trees

机译:树的在线排名算法

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摘要

A node k-ranking of a graph G = (V, E) is a proper node coloring C: V → {1, 2, ..., k} such that any path in G with end nodes x, y fulfilling C(x) = C(y) contains an internal node z with C(z) > C(x). In the on-line version of this problem, the nodes v_1, v_2, ... , v_n are coming one by one in an arbitrary order; and only the edges of the induced subgraph G[{v_1, v_2, ... , v_i}] are known when the color of v_i has to be chosen. This paper gives an on-line ranking algorithm for general trees and an optimal on-line ranking algorithm for the special trees, K_(1,n), also called stars.
机译:图G =(V,E)的节点k排序是将C着色为适当的节点:V→{1,2,...,k},使得G中端节点x,y的任何路径都满足C( x)= C(y)包含一个内部节点z,其中C(z)> C(x)。在此问题的在线版本中,节点v_1,v_2,...,v_n以任意顺序一个接一个地移动;当必须选择v_i的颜色时,只有诱导子图G [{v_1,v_2,...,v_i}]的边缘是已知的。本文给出了一般树的在线排序算法和特殊树的最优在线排序算法,K_(1,n),也称为星。

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