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
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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
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176
Determine whether an integer is a palindrome. Do this without extra space.
Some
hints:
Could negative integers be palindromes? (ie, -1)
If you are thinking of converting the integer to string...
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其他好文 时间：
2014-07-05 10:44:29
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227
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
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196
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】
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
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212
PalindromesA regular palindrome is a string of numbers or letters that is the same forward as backward. For example, the string"ABCDEDCBA"is a palindr...
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其他好文 时间：
2014-07-01 18:52:11
阅读次数：
460
Given a string containing just the characters '(' and ')',
find the
length of the longest valid (well-formed) parentheses substring.For "(()",
the
longest valid parentheses substring is "()...
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其他好文 时间：
2014-07-01 09:09:06
阅读次数：
156
