题意翻译 题目描述 给你一个字符串s由小写字母组成,有q组询问,每组询问给你两个数,l和r,问在字符串区间l到r的字串中,包含多少回文串. 输入格式 第1行,给出s,s的长度小于5000 第2行给出q(1<=q<=10^6) 第2至2+q行 给出每组询问的l和r 输出格式 输出每组询问所问的数量. 题目描述 You've got a string s=\(s_{1}\)\(s_{2}\)...\(s_{|s|}\) of length |s| , consisting of lowercase…

题目链接:http://codeforces.com/problemset/problem/245/H 题目大意:给你一个字符串s,对于每次查询,输入为一个数对(i,j),输出s[i..j]之间回文串的个数. 容斥原理: dp[i][j] = dp[i+1][j]+dp[i][j-1]-dp[i+1][j-1]; if( str[i]==str[j] 并且 str[i+1..j-1]是回文串 ) dp[i][j]++; 代码: #include <cstdio> #include <cs…

首先马拉车一遍(或者用hash),再做个前缀和处理出f[i][j]表示以j为右端点,左端点在[i,j]的回文串个数 然后设ans[i][j]是[i,j]之间的回文串个数,那就有ans[i][j]=ans[i][j-1]+f[i][j] #include<bits/stdc++.h> #define pa pair<int,int> #define CLR(a,x) memset(a,x,sizeof(a)) using namespace std; typedef long lon…

题目描述 给你一个字符串s由小写字母组成,有q组询问,每组询问给你两个数,l和r,问在字符串区间l到r的字串中,包含多少回文串. 时空限制 5000ms,256MB 输入格式 第1行,给出s,s的长度小于5000 第2行给出q(1<=q<=10^6) 第2至2+q行 给出每组询问的l和r 输出格式 输出每组询问所问的数量. 样例 样例输入 caaaba 5 1 1 1 4 2 3 4 6 4 5 样例输出 1 7 3 4 2 题解 通常思路不止一种,由于时间给的宽泛,这里给出记忆化搜索的方案.…

[CF245H]Queries for Number of Palindromes(回文树) 题面 洛谷 题解 回文树,很类似原来一道后缀自动机的题目 后缀自动机那道题 看到\(n\)的范围很小,但是\(Query\)很多 所以提前预处理出每一段\(l,r\)的答案 时间复杂度\(O(n^2+Q)\) #include<iostream> #include<cstdio> #include<cstdlib> #include<cstring> #includ…

Queries for Number of Palindromes Problem's Link:   http://codeforces.com/problemset/problem/245/H Mean: 给你一个字符串,然后q个询问:从i到j这段字符串中存在多少个回文串. analyse: dp[i][j]表示i~j这段的回文串数. 首先判断i~j是否为回文,是则dp[i][j]=1,否则dp[i][j]=0; 那么dp[i][j]=dp[i][j]+dp[i][j-1]+dp[i+1[j…

Queries for Number of Palindromes time limit per test 5 seconds memory limit per test 256 megabytes input standard input output standard output You've got a string s = s1s2... s|s| of length |s|, consisting of lowercase English letters. There also ar…

H. Queries for Number of Palindromes time limit per test 5 seconds memory limit per test 256 megabytes input standard input output standard output You've got a string s = s1s2... s|s| of length |s|, consisting of lowercase English letters. There also…

H. Queries for Number of Palindromes time limit per test 5 seconds memory limit per test 256 megabytes input standard input output standard output You've got a string s = s1s2... s|s| of length |s|, consisting of lowercase English letters. There also…

You've got a string s = s1s2... s|s| of length |s|, consisting of lowercase English letters. There also are q queries, each query is described by two integers li, ri (1 ≤ li ≤ ri ≤ |s|). The answer to the query is the number of substrings of string s…

You've got a string s = s1s2... s|s| of length |s|, consisting of lowercase English letters. There also are q queries, each query is described by two integers li, ri (1 ≤ li ≤ ri ≤ |s|). The answer to the query is the number of substrings of string s…

题目大意 给定一个字符串s,q个查询,每次查询返回s[l-r]含有的回文子串个数(题目地址) 题解 和有一次多校的题目长得好相似,这个是回文子串个数,多校的是回文子序列个数 用dp[i][j]表示,s[i..j]含有的回文子串个数,则dp[i][j]=dp[i][j-1]+dp[i+1][j]-dp[i+1][j-1]+flag[i][j](如果s[i..j]是回文子串则flag[i][j]=1,否则为0) 代码: #include<iostream> #include<cstring&…

http://codeforces.com/contest/245/problem/H 题意:给定一个字符串,每次给个区间,求区间内有几个回文串(n<=5000) 思路:设定pd[i][j]代表i~j这部分是不是一个回文串,这个可以n^2预处理 然后设定f[i][j]代表i~j区间有多少个回文串,由于满足区间加减,因此有 f[i][j]=f[i+1][j]+f[i][j-1]-f[i+1][j-1]+pd[i][j] #include<cstdio> #include<cmath&…

题目链接 给一个字符串, q个询问, 每次询问求出[l, r]里有多少个回文串. 区间dp, dp[l][r]表示[l, r]内有多少个回文串. dp[l][r] = dp[l+1][r]+dp[l][r-1]-dp[l+1][r-1]+flag[l][r], 如果是回文串flag[l][r]为1. #include <iostream> #include <vector> #include <cstdio> #include <cstring> #incl…

题目链接:http://codeforces.com/problemset/problem/245/H 题意: 给你一个字符串s. 然后有t个询问,每个询问给出x,y,问你区间[x,y]中的回文子串的个数. 题解: 表示状态: dp[x][y] = numbers 表示区间[x,y]中的回文子串个数. 找出答案: 每次询问:ans = dp[x][y] 如何转移: dp[x][y] = dp[x][y-1] + dp[x+1][y] - dp[x+1][y-1] + pal[x][y] 用到了容…

Times:5000ms: Memory limit:262144 kB 给定字符串S(|S|<=5000),下标由1开始.然后Q个问题(Q<=1e6),对于每个问题,给定L,R,回答区间[L,R]里有多少个回文串. 请想出两种或者以上的方法. ------------------------分界线-------------------------- 方法1:区间DP.           容斥一下,dp[i][j]=dp[i][j-1]+dp[i+1][j]-dp[i+1][j-1]+ok[…

题目链接:http://codeforces.com/contest/245/problem/H 题意:给出一个字符串还有q个查询,输出每次查询区间内回文串的个数.例如aba->(aba,a,b,a)有4个 题解:如果遇到区间而且数又不大n*n能存下来的可以考虑一下用区间dp,然后区间dp一般都是可以通过 预处理来减少for的层数,这里可以预处理一下Is[i][j]表示i,j区间是否是回文串然后dp转移方程就显而易见了. dp[i][j]=dp[i+1][j]+dp[i][j-1]-dp[i+1…

The Number of Palindromes Problem Description Now, you are given a string S. We want to know how many distinct substring of S which is palindrome. Input The first line of the input contains a single integer T(T<=20), which indicates number of test ca…

[SPOJ]NUMOFPAL - Number of Palindromes(Manacher,回文树) 题面 洛谷 求一个串中包含几个回文串 题解 Manacher傻逼题 只是用回文树写写而已.. #include<iostream> #include<cstdio> #include<cstdlib> #include<cstring> #include<cmath> #include<algorithm> #include<…

SP7586 NUMOFPAL - Number of Palindromes 题意翻译 求一个串中包含几个回文串 输入输出格式 输入格式: The string S. 输出格式: The value of function NumPal(s). 说明 $ 0 < |s| \le 1000$ 简单题,练个手. \(manacher\)求出每个位置回文串长度,把长度加在一起就可以了. Code: #include <cstdio> #include <cstring> cons…

The Number of Palindromes Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)http://acm.hdu.edu.cn/showproblem.php?pid=3948 Problem Description Now, you are given a string S. We want to know how many distinct substri…

Number of Palindromes Time Limit: 100MS   Memory Limit: 1572864KB   64bit IO Format: %lld & %llu Submit Status Description Each palindrome can be always created from the other palindromes, if a single character is also a palindrome. For example, the…

题意翻译 求一个串中包含几个回文串 题目描述 Each palindrome can be always created from the other palindromes, if a single character is also a palindrome. For example, the string "malayalam" can be created by some ways: malayalam = m + ala + y + ala + m malayalam = m…

后缀数组求不重复回文子串数目.注意dp数组. /* 3948 */ #include <iostream> #include <sstream> #include <string> #include <map> #include <queue> #include <set> #include <stack> #include <vector> #include <deque> #include &l…

题意 求一个字符串中本质不同的回文子串的个数. $ 1\leq |string| \leq 100000$ 思路 好像是回文自动机的裸题,但是可以用 \(\text{Manacher}\) (马拉车)算法配合后缀数组(或配合哈希表)解决. \(\text{Manacher}\) 算法非常短小精悍,它可以在线性时空内求出以每个点为中心拓展的最远距离,筛出与 \(n\) 同阶个数个回文串,这些回文串包含原串所有本质不同的回文串. 为了判掉奇偶串的问题,我们为字符串穿插一个特殊字符,如字符串 abcc…

Description 求一个串中包含几个回文串. Input 输入一个字符串\(S\) Output 包含的回文串的个数. 看到题解里面有人人写回文自动机. 有必要那么麻烦嘛 emmm 我们直接跑\(Manacher\)就好了啊. 答案就是以每一位为中心的回文串长度/2的和. (如果添加字符则为回文半径长度/2.) 这个就不多解释了.很明显的一个东西. 不能理解的话,可以看下这个 # a # a # b # a # a # 1 2 3 2 1 6 1 2 3 2 1 数字对应于每一个位置的回文…

Codeforces 55D Beautiful Number a positive integer number is beautiful if and only if it is divisible by each of its nonzero digits. Input The first line of the input contains the number of cases t (1 ≤ t ≤ 10). Each of the next t lines contains two…

2780: Poi2006 Palindromes Time Limit: 10 Sec  Memory Limit: 512 MBSubmit: 15  Solved: 5[Submit][Status][Web Board] Description A word is called a palindrome if we read from right to left is as same as we read from left to right. For example, "dad&quo…

Finding Palindromes Time Limit: 10000MS   Memory Limit: 262144K Total Submissions:4710   Accepted: 879 Case Time Limit: 2000MS Description A word is called a palindrome if we read from right to left is as same as we read from left to right. For examp…

Finding Palindromes http://poj.org/problem?id=3376 Time Limit: 10000MS   Memory Limit: 262144K       Case Time Limit: 2000MS Description A word is called a palindrome if we read from right to left is as same as we read from left to right. For example…