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39. Recover Binary Search Tree && Validate Binary Search Tree
思想: Morris traversal. Solution 1 : Preorder traversal Solution 2: Inorder traversal. Solution 3: Morris Traversal.
分类:其他好文   时间:2014-08-27 20:25:48    阅读次数:273
36. Construct Binary Tree from Inorder and Postorder Traversal && Construct Binary Tree from Preorder and Inorder Traversal
思想: 迭代。 说明: 这类问题,要求一个提供根节点,然后另一个序列(中序序列)可依据根节点分出左右子树。
分类:其他好文   时间:2014-08-27 20:20:38    阅读次数:198
37. Binary Tree Zigzag Level Order Traversal && Binary Tree Inorder Traversal
思路: 使用两个队列(一个可以顺序读,所以用vector模拟),每个队列放一层结点。 题解: 两种方法: 1. 使用栈: O(n) Time, O(n) Space。 2. Morris traversal (构造线索树), O(n) Time, O(1) Space.
分类:其他好文   时间:2014-08-27 20:16:18    阅读次数:227
35. Binary Tree Level Order Traversal && Binary Tree Level Order Traversal II
思想: 若递归,传入层号。若迭代,使用队列,在每层结束时,加入一个标记。 思想: 目前用两种方法:1 同上,最后将结果反转一下。 2.先求出最大层数,再层序遍历。(也许还有更好的方法)
分类:其他好文   时间:2014-08-27 20:16:08    阅读次数:212
【Leetcode长征系列】Construct Binary Tree from Inorder and Postorder Traversal
原题: Given inorder and postorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. 思路:和上一题一样,后续我们可以通过最后一个值得到根的值,同样可以通过定位根的值得到左右子树的...
分类:其他好文   时间:2014-08-21 17:22:24    阅读次数:138
Populating Next Right Pointers in Each Node II
Follow up for problem "Populating Next Right Pointers in Each Node". What if the given tree could be any binary tree? Would your previous solution still work? Note: You may only use constant extr...
分类:其他好文   时间:2014-08-20 22:47:33    阅读次数:297
Binary Tree Inorder Traversal
Given a binary tree, return the inorder traversal of its nodes' values.For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3return [1,3,2]....
分类:其他好文   时间:2014-08-18 23:29:53    阅读次数:254
Binary Tree Zigzag Level Order Traversal
Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and ...
分类:其他好文   时间:2014-08-17 18:25:02    阅读次数:233
Construct Binary Tree from Preorder and Inorder Traversal
Given preorder and inorder traversal of a tree, construct the binary tree.Note:You may assume that duplicates do not exist in the tree.思路:利用先序遍历提供的根节点...
分类:其他好文   时间:2014-08-17 16:54:02    阅读次数:160
Construct Binary Tree from Inorder and Postorder Traversal
Given inorder and postorder traversal of a tree, construct the binary tree.Note:You may assume that duplicates do not exist in the tree.思路:利用后序遍历提供的根节...
分类:其他好文   时间:2014-08-17 16:52:12    阅读次数:228
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