Finding Biconnected Components and Computing Tree Functions in Logarithmic Parallel Time (Extended Summary)
Finding Biconnected Components and Computing Tree Functions in Logarithmic Parallel Time (Extended Summary)
复制标题
在对数并行时间内查找双连通分量并计算树函数(扩展摘要)
DOI:
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发表时间:
1984
期刊:
影响因子:
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通讯作者:
U. Vishkin
中科院分区:
文献类型:
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作者:
R. Tarjan;U. Vishkin
We propose a new algorithm for finding the blocks (biconnected components) of an undirected graph. A serial implementation runs in 0[n+m] time and space on a graph of n vertices and m edges. A parallel implmentation runs in 0[log n] time and 0[n+m] space using 0[n+m] processors on a concurrent-read, concurrent-write parallel RAM. An alternative implementation runs in 0[n/sup 2/p] time and 0[n/sup 2/] space using any number p ⩽ n/sup 2/log/sup 2/-n of processors, on a concurrent-read, exclusive-write parallel RAM. The latter algorithm has optimal speedup, assuming an adjacency matrix representation of the input. A general algorithmic technique which simplifies and improve computation of various functions on tress is introduced. This technique typically requires 0(log n) time using 0(n) space on an exclusive-read exclusive-write parallel RAM.