Examlex
Head Instance Variable
A variable, typically in a linked list or similar data structure, that holds a reference to the first element or node.
Null
A special marker used in programming to denote that a variable does not hold any valid object or value at a particular time.
Preorder Processing
A type of tree traversal where each node is processed before its child nodes.
Root Node
The topmost node in a tree data structure, from which all other nodes descend.
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