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LeetCode[Hash Table]: Valid Sudoku
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 su...
分类:其他好文   时间:2014-11-24 10:09:21    阅读次数:208
【leetcode】Evaluate Reverse Polish Notation
Evaluate Reverse Polish Notation题目描述:Evaluate the value of an arithmetic expression in Reverse Polish Notation.Valid operators are +, -,, /. Each oper...
分类:其他好文   时间:2014-11-23 14:25:38    阅读次数:176
c++ how to make your own class a valid key type for std::map?
In Java, if you want your own class to be a valid key type of the container, you just need to make it implement the interface "Comparable", and then i...
分类:编程语言   时间:2014-11-22 22:51:01    阅读次数:272
安装ruby on rails一直报Unable to download data from https://rubygems.org/的解决方案
如题,在用gem install rails时一直报这个错误,完整的错误信息如下: ERROR:  Could not find a valid gem 'rails' (>= 0), here is why:           Unable to download data from https://rubygems.org/ - Errno::ETIMEDOUT: Connection ...
分类:Web程序   时间:2014-11-22 10:40:23    阅读次数:186
CodeForces 486D Valid Sets
题意: 给定一棵n(2000)个节点的树  每个节点上有个数字  问  有多少棵子树满足树中最大数字与最小数字的差不超过d 思路: 根据数据猜复杂度可能为n^2  想到尝试树形dp 假如枚举现在树中的最大值  那么最小值可以求出  这时不在数值范围内的节点都可以标记掉 那么假设这个最大值的点我一定选取  那么就可以dp出一定选这个点的情况下子树的种类数 假设u是父节点  v是子节点...
分类:其他好文   时间:2014-11-21 21:56:47    阅读次数:212
LeetCode: Longest Valid Parentheses 解题报告
Longest Valid ParenthesesGiven a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses sub...
分类:其他好文   时间:2014-11-21 20:31:10    阅读次数:235
Leetcode-Longest Valid Parentheses
Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring.For "(()", the lon...
分类:其他好文   时间:2014-11-21 14:00:49    阅读次数:172
Evaluate Reverse Polish Notation
Evaluate the value of an arithmetic expression inReverse Polish Notation.Valid operators are+,-,*,/. Each operand may be an integer or another express...
分类:其他好文   时间:2014-11-21 12:15:28    阅读次数:149
Valid Password
ProblemIn 1-9 keypad one key is not working. If someone enters a password then not working key will not be entered. You have given expected password a...
分类:其他好文   时间:2014-11-21 06:58:11    阅读次数:197
Telephone Number
ProblemPrint all valid phone numbers of length n subject to following constraints:If a number contains a 4, it should start with 4No two consecutive d...
分类:其他好文   时间:2014-11-21 06:54:39    阅读次数:149
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