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!HDU 1513 Palindrome--dp--(最长公共子序列模型)
题意:给定一个字符序列,求最少添加多少个字符能让它变成对称序列 分析:这题的做法竟然是把序列颠倒之后求最长公共子序列,然后n-dp[n][n]就是答案。记住这种做法。          在这里再说一次最长公共子序列的做法:dp[i][j]表示序列1的前i个字符和序列2的前j个字符比较时的最长公共子序列的长度,状态转移公式:1.当a[i]==b[j]时,dp[i][j]=dp[i-1][j-1]...
分类:其他好文   时间:2015-06-21 21:11:44    阅读次数:123
leetcode | Valid Palindrome
Valid Palindrome : https://leetcode.com/problems/valid-palindrome/Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.For example, “A man, a pl...
分类:其他好文   时间:2015-06-21 18:34:26    阅读次数:110
Valid Palindrome
Description:Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.For example,"A man, a plan, a...
分类:其他好文   时间:2015-06-21 17:14:49    阅读次数:93
#9 Palindrome Number
题目链接:https://leetcode.com/problems/palindrome-number/ Determine whether an integer is a palindrome. Do this without extra space. click to show spoilers. Some hints: Could negative inte...
分类:其他好文   时间:2015-06-21 15:52:27    阅读次数:145
Leetcode 9 Palindrome Number
Determine whether an integer is a palindrome. Do this without extra space.利用余数构造倒置数再判断。var isPalindrome = function(x) { var y = 0 var t = x w...
分类:其他好文   时间:2015-06-20 23:30:33    阅读次数:317
[转]O(n)回文子串算法 Manacher算法
这里,我介绍一下O(n)回文串处理的一种方法。Manacher算法.原文地址:http://zhuhongcheng.wordpress.com/2009/08/02/a-simple-linear-time-algorithm-for-finding-longest-palindrome-sub....
分类:编程语言   时间:2015-06-20 13:08:23    阅读次数:192
LeetCode——Valid Palindrome
Description:Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.For example, "A man, a plan, ...
分类:其他好文   时间:2015-06-19 22:59:13    阅读次数:165
[LeetCode-JAVA] Shortest Palindrome
题目:Given a string S, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you ca...
分类:编程语言   时间:2015-06-18 23:42:31    阅读次数:198
[LeetCode]Palindrome Number
题意:又是回文判断:该数是否是回文数原题来自:https://leetcode.com/problems/palindrome-number/分析:回文真多,直接把数反转来判断是否相等。 1 class Solution { 2 public: 3 bool isPalindrome(int...
分类:其他好文   时间:2015-06-18 21:42:04    阅读次数:114
9 Palindrome Number(判断是否为回文数Easy)
题目意思:判断是否为回文数,不许使用额外空间 ps:一直不理解额外空间的意思,int能用吗思路:1.比较头尾 2.翻转,越界问题需考虑 1 class Solution { 2 public: 3 bool isPalindrome(int x) { 4 if(x...
分类:其他好文   时间:2015-06-18 19:04:49    阅读次数:96
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