Abstract
The maximum common subgraph problem is NP-hard even if the two input graphs are partial k-trees. We present a polynomial time algorithm for finding the maximum common connected induced subgraph of two bounded degree graphs G 1 and G 2, where G 1 is a partial k-tree and G 2 is a graph whose possible spanning trees are polynomially bounded. The key idea of our algorithm is that for each spanning tree generated from G 2, a candidate for the maximum common connected induced subgraph is generated in polynomial time since a subgraph of a partial k-tree is also a partial k-tree. Among all of these candidates, we can find the maximum common connected induced subgraph for G 1 and G 2.
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