On query languages for the P-string data model
Information modelling and knowledge bases
On the complexity of finding iso- and other morphisms for partial k-trees
Discrete Mathematics - Topological, algebraical and combinatorial structures; Froli´k's memorial volume
Ordered and Unordered Tree Inclusion
SIAM Journal on Computing
More efficient algorithm for ordered tree inclusion
Journal of Algorithms
The Art of Computer Programming Volumes 1-3 Boxed Set
The Art of Computer Programming Volumes 1-3 Boxed Set
A new tree inclusion algorithm
Information Processing Letters
Hi-index | 0.89 |
Very recently, Chen and Chen [Y. Chen, Y. Chen, A new tree inclusion algorithm, Information Processing Letters 98 (2006) 253-262] gave a new algorithm for the tree inclusion problem, which requires O(|T|xmin{depth(P),|leaves(P)|}) time and no extra space. In this Note, we show that there are flaws in their time-complexity analysis by presenting two counterexamples. We also give an example to show that the worst-case time complexity of their algorithm is non-polynomial. Consequently, the asymptotically most efficient algorithm for the tree inclusion problem is the former algorithm in [W. Chen, More efficient algorithm for ordered tree inclusion, Journal of Algorithms 26 (1998) 370-385].