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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|×min{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...
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