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2. Tree (abstract data type) - Wikipedia

   en.wikipedia.org/wiki/Tree_(abstract_data_type)

   The height of the root is the height of the tree. The depth of a node is the length of the path to its root (i.e., its root path). Thus the root node has depth zero, leaf nodes have height zero, and a tree with only a single node (hence both a root and leaf) has depth and height zero. Conventionally, an empty tree (tree with no nodes, if such ...

3. Blue's Clues Kindergarten - Wikipedia

   en.wikipedia.org/wiki/Blue's_Clues_Kindergarten

   Blue's Clues Kindergarten is a Windows and Macintosh PC video game distributed on CD-ROM. [2] Based on the television series Blue's Clues , kids can learn different skills that will help them get ready for grade school.

4. Tree (graph theory) - Wikipedia

   en.wikipedia.org/wiki/Tree_(graph_theory)

   The root has depth zero, leaves have height zero, and a tree with only a single vertex (hence both a root and leaf) has depth and height zero. Conventionally, an empty tree (a tree with no vertices, if such are allowed) has depth and height −1. A k-ary tree (for nonnegative integers k) is a rooted tree in which each vertex has at most k children.

5. Ternary tree - Wikipedia

   en.wikipedia.org/wiki/Ternary_tree

   The root node is at depth zero. Height - Length of the path from the root to the deepest node in the tree. A (rooted) tree with only one node (the root) has a height of zero. In the example diagram, the tree has height of 2. Sibling - Nodes that share the same parent node. A node p is an ancestor of a node q if it exists on the path from q to ...

6. Unrooted binary tree - Wikipedia

   en.wikipedia.org/wiki/Unrooted_binary_tree

   The leaf-to-leaf path-length on a fixed Unrooted Binary Tree (UBT) T encodes the number of edges belonging to the unique path in T connecting a given leaf to another leaf. For example, by referring to the UBT shown in the image on the right, the path-length p 1 , 2 {\displaystyle p_{1,2}} between the leaves 1 and 2 is equal to 2 whereas the ...

7. Binary tree - Wikipedia

   en.wikipedia.org/wiki/Binary_tree

   A labeled binary tree of size 9 (the number of nodes in the tree) and height 3 (the height of a tree defined as the number of edges or links from the top-most or root node to the farthest leaf node), with a root node whose value is 1. The above tree is unbalanced and not sorted.