Palindrome subsequence Problem Description In mathematics, a subsequence is a sequence that can be derived from another sequence by deleting some elements without changing the order of the remaining elements. For example, the sequence <A, B, D> is a…

Palindrome subsequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/65535 K (Java/Others)Total Submission(s): 4513    Accepted Submission(s): 1935 Problem Description In mathematics, a subsequence is a sequence that can be derived f…

标签(空格分隔): 区间qp Palindrome subsequence \[求一个string的 回文子序列 的个数 \] 少废话,上代码. #include<bits/stdc++.h> //头文件没有什么问题 using namespace std; //名字空间没有什么问题 const int maxn = 1000 +5; // 字符串的最大长度 const int mod = 10007;//题目规定的模数 int n,cnt;//n:有多少个字符串,cnt:记录当前有多少个ca…

题目链接:http://acm.split.hdu.edu.cn/showproblem.php?pid=4632 题意:求回文串子串的的个数. 思路:看转移方程就能理解了. dp[i][j] 表示区间i j 之间的回文子串的个数. 状态转移方程:dp[i][j]=dp[i][j-1]+dp[i+1][j]-dp[i+1][j-1];         if(str[i]==str[j]) dp[i][j]=dp[i][j]+dp[i+1][j-1]+1; 代码: #include<iostrea…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4632 题意:给你一个序列,问你该序列中有多少个回文串子序列,可以不连续. 思路:dp[i][j]表示序列i到j中具有的回文串序列数. 当s[i]==s[j], dp[i][j]=dp[i+1][j]+dp[i][j-1]+1 否则 dp[i][j]=dp[i+1][j]+dp[i][j-1]-dp[i+1][j-1]: #include <iostream> #include <cstdio…

link:http://acm.hdu.edu.cn/showproblem.php?pid=4632 refer to: o(╯□╰)o……明明百度找的题解,然后后来就找不到我看的那份了,这位哥们对不住了…… #include <iostream> #include <cstdio> #include <cstdlib> #include <cstring> #include <cmath> #include <cctype> #i…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4632 问题要求回答一串字符串中回文子序列的数量,例如acbca就有 a,c,b,c,a,cc,aa,aca,aca(注意这两个aca的c是不同位置的c,都要累计),aba,cbc,acca,acbca.共13种. 我们如果构造dp[i][j]为区间从i-j的回文子序列个数,当i==j时dp[i][j]=1,当i!=j时,如果字符串i,j位相等,他们便可以从dp[i+1,j-1]转移而来,即dp[i]…

Palindrome subsequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/65535 K (Java/Others)Total Submission(s): 2232    Accepted Submission(s): 889 Problem Description In mathematics, a subsequence is a sequence that can be derived fr…

Palindrome subsequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/65535 K (Java/Others)Total Submission(s): 558    Accepted Submission(s): 203 Problem Description In mathematics, a subsequence is a sequence that can be derived fro…

Palindrome subsequence Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 131072/65535 K (Java/Others) Total Submission(s): 2836 Accepted Submission(s): 1160 Problem Description In mathematics, a subsequence is a sequence that can be derived from a…