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...
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其他好文 时间:
2014-06-20 12:14:49
阅读次数:
262
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...
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其他好文 时间:
2014-06-20 11:06:46
阅读次数:
257
【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
...
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其他好文 时间:
2014-06-20 10:53:08
阅读次数:
181
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...
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其他好文 时间:
2014-06-20 10:22:00
阅读次数:
221
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...
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其他好文 时间:
2014-06-20 09:46:33
阅读次数:
267
题目
Given a binary tree, determine if it is height-balanced.
For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node...
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其他好文 时间:
2014-06-20 09:02:56
阅读次数:
232
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...
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其他好文 时间:
2014-06-07 14:50:37
阅读次数:
231
【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...
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其他好文 时间:
2014-06-07 14:28:36
阅读次数:
215
【题目】
Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum.
For example:
Given the below binary tree and sum = 22,
5
/ ...
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其他好文 时间:
2014-06-07 13:57:37
阅读次数:
210
【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