二元搜尋樹簡單易懂，不過有一個問題：它並非平衡樹。本章將介紹平衡的 AVL 搜尋樹，討論它的資料結構、函式，並設計程式使用它。 -Simple binary search tree, but there is a problem: it is not a balanced tree. This chapter will introduce a balanced AVL search tree, to discuss its information structure, function, and design program to use it.