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", ...
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其他好文 时间:
2014-07-10 19:39:53
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146
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: P...
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其他好文 时间:
2014-07-09 21:38:15
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207
题目:Given a string containing just the characters'(',')','{','}','['and']', determine if the input string is valid.The brackets must close in the corre...
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其他好文 时间:
2014-07-09 21:12:58
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221
1、回车换行符chr(10)是换行符,chr(13)是回车,增加换行符select ' update ' || table_name ||' set VALID_STATE =''0A'';'||chr(13)||' commit;'from user_tables删除换行符select id,re...
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数据库 时间:
2014-07-09 20:29:12
阅读次数:
270
Implement a function to check if a linked list is a palindrome.Reverse the second half of the list and then compare it with the first half./* Assume t...
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其他好文 时间:
2014-07-09 14:25:04
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176
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 ...
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其他好文 时间:
2014-07-08 23:12:45
阅读次数:
298
检测链表是否是palindrome.思路1:翻转并比较。思路2:迭代。思路3:递归。 public static boolean isPalindrome(LinkedListNode head) { LinkedListNode fast = head; Link...
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其他好文 时间:
2014-07-08 17:15:57
阅读次数:
267
一种方法是先翻转当前数,然后把它和原数比较(略)另一种是递归方法,借用一个复制数,对原数递归,使之翻转,然后配合复制数比较package recursion;
public class Check_if_a_number_is_palindrome {
public static void main(String[] args) {
int num = 121321;
System....
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其他好文 时间:
2014-07-08 17:13:55
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188
Palindrome
Time Limit: 3000MS
Memory Limit: 65536K
Total Submissions: 51518
Accepted: 17733
Description
A palindrome is a symmetrical string, that is, a string read...
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其他好文 时间:
2014-07-08 10:56:08
阅读次数:
204
$sudo easy_install PILWARNING: '' not a valid package name; please use only.-separated package names in setup.py_imaging.c:75:20: fatal error: Python....
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编程语言 时间:
2014-07-06 13:45:43
阅读次数:
256