Definition: A variant of stack in which one other cactus stack may be attached to the top. An attached stack is called a "branch." When a branch becomes empty, it is removed. Pop is not allowed if there is a branch. A branch is only accessible through the original reference; it is not accessible through the stack.
Formal Definition: The operations new to this variant of stack, branch(S, T) and notch(v), may be defined with axiomatic semantics as follows.
Also known as saguaro stack.
Generalization (I am a kind of ...)
Note: A saguaro is a kind of branching cactus.
Pictures and a description of saguaro cactus.
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Entry modified 14 December 2020.
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Cite this as:
Paul E. Black, "cactus stack", in Dictionary of Algorithms and Data Structures [online], Paul E. Black, ed. 14 December 2020. (accessed TODAY) Available from: https://www.nist.gov/dads/HTML/cactusstack.html