题目：Given a binary tree, determine if it is a valid
binary search tree (BST).Assume a BST is defined as follows:The left subtree of
a node contains onl...
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其他好文 时间：
2014-05-23 12:20:50
阅读次数：
407
1、
??
Balanced Binary Tree
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 subt...
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其他好文 时间：
2014-05-23 08:19:19
阅读次数：
282
Determine whether an integer is a palindrome.
Do this without extra space.if use recursive, like check the first dig and last
dig, then remove them, c...
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其他好文 时间：
2014-05-23 02:45:15
阅读次数：
230
【题目】
Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules.
The Sudoku board could be partially filled, where empty cells are filled with the character '.'.
A partially filled sudoku which is valid.
Note:
A valid Sudoku board (par...
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其他好文 时间：
2014-05-22 09:58:54
阅读次数：
234
Given a string, determine if it is a
palindrome, considering only alphanumeric characters and ignoring cases.For
example,"A man, a plan, a canal: Pana...
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其他好文 时间：
2014-05-21 21:20:54
阅读次数：
291
1、 matlab函数bwareaopen──删除小面积对象格式：BW2 =
bwareaopen(BW,P,conn)作用：删除二值图像BW中面积小于P的对象，默认情况下使用8邻域。算法：(1)Determine the
connected components. L = bwlabeln(BW,...
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其他好文 时间：
2014-05-21 03:38:44
阅读次数：
300
Given a binary tree, determine if it is a valid
binary search tree (BST).Assume a BST is defined as follows:The left subtree of
a node contains only n...
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其他好文 时间：
2014-05-19 07:23:48
阅读次数：
357
Given a string containing just the characters '(', ')', '{', '}', '[' and ']',
determine if the input string is valid.
The brackets must close in the correct order, "()" and "()[]{}" are
all vali...
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其他好文 时间：
2014-05-18 15:11:17
阅读次数：
249
【题目】
Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]" are not.
【题意】
判断给定的字符串是否是合法的...
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其他好文 时间：
2014-05-18 10:08:11
阅读次数：
327
1、
??
Path Sum
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...
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其他好文 时间：
2014-05-18 03:25:06
阅读次数：
301
