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…

备忘. /*看到n可以取到2*10^9.说明普通方法一个个暴力计算肯定会超时的,那打表呢?打表我们要先写个打表的代码,这里不提供.打完表观察数据,我们会发现数据其实是有规律的.完全不需要暴力的把所有数据打出来了! 通过数据我们发现,第n个回文数的规律如下: 1位的回文数有9个 2位的回文数有9个 3位的回文数有90个 4位的回文数有90个 5位的回文数有900个 6位的回文数有900个 原因是什么呢,如四位数的回文数个数,我们只看字符串的一半,从1001到9999,只看一半就是共有90个回文数.…

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…

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…

[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 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…

P1217 [USACO1.5]回文质数 Prime Palindromes 题目描述 因为151既是一个质数又是一个回文数(从左到右和从右到左是看一样的),所以 151 是回文质数. 写一个程序来找出范围[a,b](5 <= a < b <= 100,000,000)( 一亿)间的所有回文质数; 输入输出格式 输入格式: 第 1 行: 二个整数 a 和 b . 输出格式: 输出一个回文质数的列表,一行一个. 输入输出样例 输入样例#1: 5 500 输出样例#1: 5 7 11 101…

Three Palindromes Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1948    Accepted Submission(s): 687 Problem Description Can we divided a given string S into three nonempty palindromes?   Input…

Description The number 151 is a prime palindrome because it is both a prime number and a palindrome (it is the same number when read forward as backward). Write a program that finds all prime palindromes in the range of two supplied numbers a and b (…