题目描述:
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:
...
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其他好文 时间:
2014-11-25 10:53:22
阅读次数:
250
本文是在学习中的总结,欢迎转载但请注明出处:http://blog.csdn.net/pistolove/article/details/41450987
本文是在学习中的总结,欢迎转载但请注明出处:http://blog.csdn.net/pistolove/article/details/41450987
通过本文你能学到如下知识:
(1)对数据结构中栈的理解,特别是Stack类中的peek()方法和pop()方法的区别。
(2)理解解题思路,提高思考问题的能力。
Given a string co...
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编程语言 时间:
2014-11-24 22:40:46
阅读次数:
257
目前ios的指令集有以下几种:1,armv6,支持的机器iPhone,iPhone2,iPhone3G及对应的iTouch2,armv7,支持的机器iPhone4,iPhone4S3,armv7s,支持的机器iPhone5,iPhone5C4,arm64,支持的机器:iPhone5S机器对指令集的支...
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其他好文 时间:
2014-11-24 13:13:01
阅读次数:
206
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 nodes with keys less than the node's key.Th...
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其他好文 时间:
2014-11-24 10:11:36
阅读次数:
152
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 pa...
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其他好文 时间:
2014-11-24 10:10:28
阅读次数:
152
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...
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其他好文 时间:
2014-11-24 10:09:21
阅读次数:
208
Evaluate Reverse Polish Notation题目描述:Evaluate the value of an arithmetic expression in Reverse Polish Notation.Valid operators are +, -,, /. Each oper...
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其他好文 时间:
2014-11-23 14:25:38
阅读次数:
176
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...
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编程语言 时间:
2014-11-22 22:51:01
阅读次数:
272
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 ...
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Web程序 时间:
2014-11-22 10:40:23
阅读次数:
186
Sudoku
Time Limit: 2000MS
Memory Limit: 65536K
Total Submissions: 14120
Accepted: 6976
Special Judge
Description
Sudoku is a very simple task. A square table with...
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其他好文 时间:
2014-11-22 00:51:19
阅读次数:
201