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
【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
1. 首先安装samba服务。 2. 配置防火墙(要先关闭) 3.
创建samba服务器用户:smbpasswd -a username 删除samba服务器用户:smbpasswd -x username 4.
配置/etc/samba/smb.conf 需要配置valid user vi /et...
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系统相关 时间:
2014-05-19 15:58:50
阅读次数:
279
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
【题目】
Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.
For example, given n = 3, a solution set is:
"((()))", "(()())", "(())()", "()(())", "()()()"
【题意】
给定n对括号,输出所有可行的括号组合字符串。所谓合法,就是可以Valid Pare...
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其他好文 时间:
2014-05-18 09:06:41
阅读次数:
266
题意:
Evaluate the value of an arithmetic expression in
Reverse Polish Notation.
Valid operators are +, -, *,
/. Each operand may be an integer or another expression.
So...
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其他好文 时间:
2014-05-18 08:09:15
阅读次数:
190
判断integer是否为回文串(负数全部不为回文串)思路很直接,提取出integer中的每一位,一头一尾进行比较是否相同。一次AC
, 直接上代码:public boolean isPalindrome(int x) { if(x = 0 && x 0){ ...
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其他好文 时间:
2014-05-16 00:24:44
阅读次数:
386
1、gem安装出现下面错误
root@ubuntu:/home/git/gitlab# sudo gem install bundler --no-ri --no-rdoc
ERROR: Could not find a valid gem 'bundler' (>= 0), here is why:
Unable to download data from https...
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其他好文 时间:
2014-05-15 18:19:48
阅读次数:
304