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[leetcode]_Binary Tree Inorder Traversal
题目:二叉树的中序遍历。思路:用递归来写中序遍历非常简单。但是题目直接挑衅说,----->"Recursive solution is trivial"。好吧。谁怕谁小狗。递归代码: 1 List inOrder = new ArrayList(); 2 3 public ...
分类:其他好文   时间:2014-06-29 12:55:36    阅读次数:176
Construct Binary Tree from Preorder and Inorder Traversal
题目 Given preorder and inorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. 方法 根据树的中序遍历和前序遍历,来构造树,使用递归的思想。 Tre...
分类:其他好文   时间:2014-06-20 12:14:49    阅读次数:262
Convert Sorted Array to Binary Search Tree
题目 Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 方法 数组是有序的,要求创建的二叉树尽量平衡,很容易想到对数组进行二分操作,左边的数组元素是左子树,右边的数组元素是右子树。进行递归操作就可以了。 TreeNode...
分类:其他好文   时间:2014-06-20 11:06:46    阅读次数:257
LeetCode: Path Sum II [113]
【题目】 Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. For example: Given the below binary tree and sum = 22, 5 / 4 8 / / 11 13 4 ...
分类:其他好文   时间:2014-06-20 10:53:08    阅读次数:181
Binary Tree Inorder Traversal
题目 Given a binary tree, return the inorder traversal of its nodes' values. For example: Given binary tree {1,#,2,3}, 1 2 / 3 return [1,3,2]. Note: Recur...
分类:其他好文   时间:2014-06-20 10:22:00    阅读次数:221
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. 方法 和有序数组的思想基本一样,将链表进行二分。 TreeNode getBST(ListNode head, int len) { i...
分类:其他好文   时间:2014-06-20 09:46:33    阅读次数:267
Construct Binary Tree from Inorder and Postorder Traversal
题目 Given inorder and postorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. 方法 根据树的中序遍历和后序遍历,来恢复树,使用递归的思想。 Tr...
分类:其他好文   时间:2014-06-07 14:50:37    阅读次数:231
LeetCode: Populating Next Right Pointers in Each Node [116]
【题目】 Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode *next; } Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be...
分类:其他好文   时间:2014-06-07 14:28:36    阅读次数:215
LeetCode: Flatten Binary Tree to Linked List [114]
【题目】 Given a binary tree, flatten it to a linked list in-place. For example, Given 1 / 2 5 / \ 3 4 6 The flattened tree should look like: 1 2 3 4 \...
分类:其他好文   时间:2014-06-07 11:37:00    阅读次数:153
LeetCode --- Validate Binary Search Tree
题目链接判断一颗二叉树是否是二叉搜索树(二叉排序树),也就是BST如果该二叉树是BST, 那么对其中序遍历,所得序列一定是单调递增的(不考虑有重复数值的情况)附上代码: 1 /** 2 * Definition for binary tree 3 * struct TreeNode { 4 *...
分类:其他好文   时间:2014-06-07 11:28:18    阅读次数:254
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