AVL在实际服务端应用中较多见，它的主要好处是原理简单并且具有良好的搜索/插入/删除速度（时间复杂度均为O(logN)).这里贴一个我写的简单实现，-AVL server-side applications in practice more see, its main advantage is that is simple in principle and has a good search/insert/delete speed (the time complexity are O (logN)). Posted here, I wrote a simple implementation,