An Interative Version of Hopcroft And Tarjans Planarity Testing Algorithm
An Interative Version of Hopcroft And Tarjans Planarity Testing Algorithm
Jiazhen Cai
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• Summary We presented a totally iterative version of Hopcroft and Tarjan's planarity testing algorithm (H-T algorithm). The control structure of our algorithm is so simple that it can be derived from one line formal specification. In H-T algorithm, the edges are visited in an order totally deter- mined by the depth first search. In our algorithm, the edges can be visited in any topological order of the DFS tree. In fact, our algorithm can be viewed as a topological sorting on the DFS tree comb...ined with some information propagation. Also, our algorithm allows some degree of parallelism: all the edges on the frontier of the DFS tree can be processed parallelly. H-T algo- rithm works on biconnected components of G, we do not need this condition. The same idea of dependency graph mentioned in [4] can be used in our algorithm to actu- ally construct a planar embedding of G, also in linear lime. • Appendix Proof of Theorem 5 We prove Theorem 5 by induction. For backedges and dead edges, we need only prove iii, which is trivially true.
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