関連ワード:  what is a tree in computer science    what is a binary tree in computer science    what is a tree structure in computer science    what is a decision tree in computer science    what is a tree data structure in computer science    what is the definition of a tree in computer science    what is the height of a tree in computer science    what is a rooted tree computer science    what is a rose tree computer science    what is derivation tree in theoretical computer science