Let this long package float, Goto private class if short. While protected with debugger case, Continue volatile interface. Instanceof super synchronized throw, Extends final export throws. Try import double enum? False, boolean,abstract function, Imp…

2795: [Poi2012]A Horrible Poem Time Limit: 50 Sec  Memory Limit: 128 MBSubmit: 484  Solved: 235[Submit][Status][Discuss] Description 给出一个由小写英文字母组成的字符串S,再给出q个询问,要求回答S某个子串的最短循环节.如果字符串B是字符串A的循环节,那么A可以由B重复若干次得到. Input 第一行一个正整数n (n<=500,000),表示S的长度.第二行n个小…

2795: [Poi2012]A Horrible Poem Time Limit: 50 Sec  Memory Limit: 128 MBSubmit: 261  Solved: 150[Submit][Status][Discuss] Description 给出一个由小写英文字母组成的字符串S,再给出q个询问,要求回答S某个子串的最短循环节.如果字符串B是字符串A的循环节,那么A可以由B重复若干次得到. Input 第一行一个正整数n (n<=500,000),表示S的长度.第二行n个小…

Pretty Poem Time Limit: 2 Seconds     Memory Limit:65536 KB Poetry is a form of literature that uses aesthetic and rhythmic qualities of language. There are many famous poets in the contemporary era. It is said that a few ACM-ICPC contestants can eve…

Poetry is a form of literature that uses aesthetic and rhythmic qualities of language. There are many famous poets in the contemporary era. It is said that a few ACM-ICPC contestants can even write poetic code. Some poems has a strict rhyme scheme li…

...字符串hash. 假如长度x是一个循环节, 那么对于任意n(x | n)也是一个循环节. 设当前询问区间[l, r]长度为len = ∏piai, 最终答案ans = ∏piai' ,我们只需枚举len的质因数来确定ai'即可 #include<bits/stdc++.h> using namespace std; typedef unsigned long long ull; const int maxn = 500009; const ull P = 1000173169; char…

#10038.A Horrible Poem 题目传送门 思路解析 既然这道题目在hash板块里,那么自然就可以想到用hash做这道题目. 首先我们可以用hash数组存储字符串的前缀的hash值. 因为我们需要找到S[a..b] 的最短循环节长度,所以我们可以枚举循环节长度 i . 由于循环要遍历完整个字串.所以设字串长度为 $len$ ,就有: if(len%i)continue; 即i为$len$的因数. 关于判断循环节,我们最先想到的就是将一个长度为i字串不断往后对比,直到遍历完长度为$l…

P3538 [POI2012]OKR-A Horrible Poem hash+线性筛 题解 <----这篇写的不错(其实是我懒得码字了qwq) UVA10298 Power Strings 的升级版 判断一个长为 u 的子串是否为 长为 n 的主串的循环子串 只要比较 [1,n-u ]和 [u+1, n]的hash值即可(所以说我以前都是瞎搞〒▽〒) 想了想,还是加点注释吧,不然为啥要写博客总结呢(逃 #include<iostream> #include<cstdio>…

2795: [Poi2012]A Horrible Poem Time Limit: 50 Sec  Memory Limit: 128 MBSubmit: 640  Solved: 322[Submit][Status][Discuss] Description 给出一个由小写英文字母组成的字符串S,再给出q个询问,要求回答S某个子串的最短循环节.如果字符串B是字符串A的循环节,那么A可以由B重复若干次得到. Input 第一行一个正整数n (n<=500,000),表示S的长度.第二行n个小…

题目传送门 A Horrible Poem 题目描述 Bytie boy has to learn a fragment of a certain poem by heart. The poem, following the best lines of modern art, is a long string consisting of lowercase English alphabet letters only. Obviously, it sounds horrible, but that…