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：
2014-07-06 16:45:00
阅读次数：
201
Validate if a given string is numeric.Some examples:"0"=>true" 0.1 "=>true"abc"=>false"1 a"=>false"2e10"=>trueNote:It is intended for the problem stat...
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其他好文 时间：
2014-07-05 17:20:00
阅读次数：
176
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：
2014-07-03 19:38:58
阅读次数：
287
Given a binary tree, determine if it is a valid binary search tree (BST).
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其他好文 时间：
2014-07-03 19:36:49
阅读次数：
196
在一个字符串中求不重复子串的最大长度是一个经典的贪心法求解问题（说子串自然是连续的，子序列则不要求连续）。
先给出leetcode上这题的描述：
Given a string, find the length of the longest substring without repeating characters. For example, the longest substring wit...
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其他好文 时间：
2014-07-03 16:24:55
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281
Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without
repeating letters for "abcabcbb" is "abc", which the length is 3. Fo...
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其他好文 时间：
2014-07-02 16:35:32
阅读次数：
213
Given a string containing only digits, restore it by returning all possible valid IP address combinations.
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其他好文 时间：
2014-07-02 14:45:41
阅读次数：
220
题目
Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.
For example,
"A man, a plan, a canal: Panama" is a palindrome.
"race a car" i...
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其他好文 时间：
2014-07-02 09:49:04
阅读次数：
271
【题目】
Given an input string, reverse the string word by word.
For example,
Given s = "the sky is blue",
return "blue is sky the".
click to show clarification.
Clarification:
What constitutes a word?
A sequence of non-space characters constitutes a word....
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其他好文 时间：
2014-07-02 08:34:34
阅读次数：
170
【题目】
Evaluate the value of an arithmetic expression in Reverse Polish Notation.
Valid operators are +, -, *, /. Each operand may be an integer or another expression.
Some examples:
["2", "1", "+", "3", "*"] -> ((2 + 1) * 3) -> 9
["4", "13", "5", "/...
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其他好文 时间：
2014-07-02 07:43:36
阅读次数：
212
