21. In a binary tree, what is the term used to describe a node with no parent?
22. What property distinguishes a binary tree from a general tree?
23. Which traversal method is typically used for creating a mirrored image of a binary tree?
24. What is the time complexity of inserting an element into an AVL tree in the worst case?
25. How does a Splay Tree ensure that recently accessed elements are quick to access again?
26. In a B-Tree, what is the significance of the "order" of the tree?
27. What is a common use case for a Trie data structure?
28. In a Red-Black Tree, what does the property that "every path from a node to its descendant leaves has the same number of black nodes" ensure?
29. What is the maximum number of nodes at level L of a binary tree?
30. What is the key difference between a binary heap and a binary search tree?
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