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 fille...
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其他好文 时间:
2015-06-11 19:33:01
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129
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 "...
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其他好文 时间:
2015-06-11 17:05:56
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123
关于手机短信接收验证码的实现原理:思路:A:获得验证码:1.找到相关的表。2.用什么发送,post,get ,ajax,当然ajax首选3.post之前要js先判断是手机号码11位,并且全部都是数字,或者用正则也行。4.用ajax发送数据data,要对数据进行检验,过滤有效数据valid 5.ins...
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移动开发 时间:
2015-06-11 16:36:48
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226
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" is not a palindr...
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其他好文 时间:
2015-06-11 14:38:52
阅读次数:
117
题目:
Valid Number
Validate if a given string is numeric.
Some examples:
"0" => true
" 0.1 " => true
"abc" => false
"1 a" => false
"2e10" => true
class Solution {
public:
bool is...
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其他好文 时间:
2015-06-10 12:22:09
阅读次数:
113
Validate Binary Search TreeGiven a binary tree, determine if it is a valid binary search tree (BST).Assume a BST is defined as follows:The left subtre...
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其他好文 时间:
2015-06-10 12:03:48
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89
基础但是要掌握 int a = 'A'这种写法,以及s.trim(); s = s.toUpperCase();public class Solution { public boolean isPalindrome(String s) { if(s==null ||...
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其他好文 时间:
2015-06-10 11:56:06
阅读次数:
101
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:
2015-06-10 06:27:16
阅读次数:
102
As you know that sometimes base conversion is a painful task. But still there are interesting facts in bases.For convenience let’s assume that we are dealing with the bases from 2 to 16. The valid symb...
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其他好文 时间:
2015-06-09 21:59:18
阅读次数:
133
yum安装时报Cannotfindavalidbaseurlforrepo:base/7/x86_6.PING国内的外网时正常。然后上网查类似的问题,发现说是DNS问题,随将DNS改成8.8.8.8重启网络服务。yum立马OK.
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Web程序 时间:
2015-06-09 20:14:54
阅读次数:
149