Balanced Search Trees

【Balanced Search Trees】的更多相关文章

平衡搜索树前面介绍的二叉搜索树在最坏情况下的性能还是很糟糕,而且我们不能控制操作的顺序,有时根本就不是随机的,我们希望找到有更好性能保证的算法. 2-3 search trees 于是先来了解下 2-3 查找树,它可以保证树的平衡性,维护树高在 lgN 级别.这里的 2,3 指的是孩子的数目,图例: 有两个孩子的节点和二叉搜索树一样,节点里有一个键,且大于左子树的键并小于右子树的键.三个孩子的节点里则有两个键,中间孩子的键的大小介于这两个键之间,左右子树一样. search 查找和二叉查找树一…

Red Black Tree 红黑树 AVL trees 2-3 trees 2-3-4 trees B-trees Red-black trees Balanced search tree 平衡搜索树

小结: 1.红黑树:典型的用途是实现关联数组 2.旋转当我们在对红黑树进行插入和删除等操作时,对树做了修改,那么可能会违背红黑树的性质.为了保持红黑树的性质,我们可以通过对树进行旋转,即修改树中某些结点的颜色及指针结构,以达到对红黑树进行插入.删除结点等操作时,红黑树依然能保持它特有的性质(五点性质). https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-046j-introduction-to-a…

并不对劲的CF1237D&E:Balanced Playlist and Binary Search Trees

CF1237D Balanced Playlist 题意有一个长度为\(n\)(\(n\leq 10^5\))的循环播放歌单,每首歌有一个优秀值\(a_i\)(\(a_i\leq 10^9\)). 听歌时选一首歌开始,如果某一首歌\(x\)的优秀值的两倍小于当前听过的歌中优秀值最大的,那么会在听完\(x\)之前停止听歌. 对于每首歌\(i\),求\(c_i\)表示如果从它开始听,最多听完几首歌,如果有重复的算多首.如果从一个位置开始能无限听下去,那么\(c_i=-1\). 题解首先发现当一个…

Method for balancing binary search trees

Method for balancing a binary search tree. A computer implemented method for balancing a binary search tree includes locating a node in a binary search tree, determining whether a depth of the located node is greater than a threshold, and performing…

Optimal binary search trees

问题该问题的实际应用 Suppose that we are designing a program to translate text from English to French. For each occurrence of each English word in the text, we need to look up its French equivalent. We could perform these lookup operations by building a binar…

[LeetCode] Unique Binary Search Trees 独一无二的二叉搜索树

Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example,Given n = 3, there are a total of 5 unique BST's. 1 3 3 2 1 \ / / / \ \ 3 2 1 1 3 2 / / \ \ 2 1 2 3 这道题实际上是Catalan Number卡塔兰数的一个例子,如果对卡塔兰数不熟悉的童鞋可能真…

[LeetCode] Unique Binary Search Trees II 独一无二的二叉搜索树之二

Given n, generate all structurally unique BST's (binary search trees) that store values 1...n. For example,Given n = 3, your program should return all 5 unique BST's shown below. 1 3 3 2 1 \ / / / \ \ 3 2 1 1 3 2 / / \ \ 2 1 2 3 confused what "{1,#,2…