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Unique Binary Search Trees II
这道题承接Unique Binary Search Trees,只需要返回搜索二叉树的个数,用DP求解。但是这道题需要得到所有树的集合,可以用DFS求解。 原题是这个样子的: 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...
分类:其他好文   时间:2014-12-17 00:23:26    阅读次数:191
Lowest Common Ancestor of a Binary Search Tree (BST)
Given a binary search tree(BST), find the lowest common ancestor of two given nodes in the BST.Node* LCA(Node* root, Node* p, Node* q){ if (!root |...
分类:其他好文   时间:2014-12-17 00:13:50    阅读次数:172
Convert Sorted List to Binary Search Tree
public TreeNode sortedListToBST(ListNode head) { if (head == null) return null; int len = 0; ListNode nextNode = head; while (nextNode != null) { nextNode = nextNode.next; len++; } return buildTree(head, 0, len - 1); } public Tree...
分类:其他好文   时间:2014-12-16 21:05:05    阅读次数:159
Unique Binary Search Trees
题目:Givenn, how many structurally uniqueBST's(binary search trees) that store values 1...n?For example,Givenn= 3, there are a total of 5 unique BST's. ...
分类:其他好文   时间:2014-12-14 18:30:16    阅读次数:176
LeetCode Convert Sorted List to Binary Search Tree
Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST.解题思路:找到链表的中点,作为根,前端作为左子树,后端作为右子树,并对前后做递归操...
分类:其他好文   时间:2014-12-13 13:21:52    阅读次数:153
【LeetCode】Convert Sorted List to Binary Search Tree
题目 Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. 解答 题目要求将链表转化为二叉查找树。利用树的中序遍历的递归思想,对链表结点一个个进行访问,先对左子树进行递归,然后将当前结点作为根,迭代到下一个链表结点,最后在递...
分类:其他好文   时间:2014-12-12 19:04:40    阅读次数:127
BST创建
思路:把数字排序,排序后数字列,中间点为父节点,左边部分为左子树,右边为右子树。   假设节点定义为: // Definition for binary tree struct TreeNode { int val; TreeNode *left; TreeNode *right; TreeNode(int x) : val(x), left(NULL), ...
分类:其他好文   时间:2014-12-11 12:31:45    阅读次数:126
[LeetCode]Recover Binary Search Tree
【题目】 Two elements of a binary search tree (BST) are swapped by mistake. Recover the tree without changing its structure. Note: A solution using O(n) space is pretty straight forward. Could...
分类:其他好文   时间:2014-12-10 12:35:23    阅读次数:191
【leetcode】 Unique Binary Search Trees (middle)☆
Givenn, how many structurally uniqueBST's(binary search trees) that store values 1...n?For example,Givenn= 3, there are a total of 5 unique BST's. 1 ....
分类:其他好文   时间:2014-12-09 13:54:28    阅读次数:205
[CLRS][CH 15.5]最优二叉查找树
背景铺垫假设我们正在设计一个翻译程序,讲英语翻译成法语,需要用一棵BST存储文章中出现的单词及等价的法语。因为要频繁地查找这棵树,所以我们希望查找时间越短越好。当然我们可以考虑使用红黑树,或者可能更适用的伸展树,来实现这一操作。但是这仍然不能满足我们的需要:由于单词出现频率不同,如果mycophag...
分类:其他好文   时间:2014-12-06 12:49:23    阅读次数:279
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