也许更好的阅读体验 \(\mathcal{Description}\) 定义一种字符串\(gray\)串满足: 长度为奇数 正中间的字母只出现一次 左右两端相同,左右两端也是gray串 一个\(gray\)串的贡献为这个串长度的平方 需要注意的是一个长度为\(7\)的\(gray\)串是包含了长度为\(1,3\)的\(gray\)的 现给你一个长为\(n(n<=100,000)\)的字符串,你可以修改至多一个字母,使得总贡献值最大 输入方式为一个字符串 \(\mathcal{Solution}\…

Codeforces 题面传送门 & 洛谷题面传送门 首先显然一个 gray 串的长度只可能是 \(2^k-1\),其中 \(k\in\mathbb{Z}\). 考虑将一个字符改成另外一个字符会对答案产生什么样的影响.显然原来包含这个字符的 gray 串的贡献都应被减掉,新出现的 gray 串的贡献又应被加上.我们分别计算两部分的贡献. 对于第一部分,由于 gray 串最多只可能有 \(n\log n\),因此我们逐一枚举它们并差分一下它们贡献.那么如何检验一个长度为 \(2^k-1\) 的字符…

hdu 3374 String Problem 最小表示法 view code#include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <map> #include <string> using namespace std; const int N = 10010; int n; char s[105]; map<…

String Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2706    Accepted Submission(s): 1140 Problem Description Give you a string with length N, you can generate N strings by left shift…

String Problem Description Give you a string with length N, you can generate N strings by left shifts. For example let consider the string “SKYLONG”, we can generate seven strings: String Rank SKYLONG 1 KYLONGS 2 YLONGSK 3 LONGSKY 4 ONGSKYL 5 NGSKYLO…

String Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1512    Accepted Submission(s): 668 Problem Description Give you a string with length N, you can generate N strings by left shifts…

HDU 3374 String Problem (KMP+最大最小表示) String Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1602    Accepted Submission(s): 714 Problem Description Give you a string with length N, you c…

String Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1492    Accepted Submission(s): 662 Problem Description Give you a string with length N, you can generate N strings by left shifts.…

Mediocre String Problem 题解: 很容易想到将第一个串反过来,然后对于s串的每个位置可以求出t的前缀和它匹配了多少个(EXKMP 或者 二分+hash). 然后剩下的就是要处理以某个位置为结束的回文串有多少个(manacher + 差分),因为要求s串选取的要多一点.这道题是个痛啊...当时的金牌题,不会EXKMP可以用二分+字符串hash啊,比赛前的暑假还写过,比赛时就没想到,还以为KMP可以搞出这个东西, 然后就三个人一起自闭地调KMP,说到底还是菜呀. 代码: #pr…

String Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4828    Accepted Submission(s): 1949 Problem Description Give you a string with length N, you can generate N strings by left shifts…

String problem 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5772 Description This is a simple problem about string. Now a string S contains only '0'-'9'. ?? wants to select a subsequence from this string. And makes this subsequence score maximum.…

wyh2000 and a string problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/65536 K (Java/Others) Total Submission(s): 484    Accepted Submission(s): 232 Problem Description Young theoretical computer scientist wyh2000 is teaching you…

http://acm.hdu.edu.cn/showproblem.php?pid=3374 String Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2045    Accepted Submission(s): 891 Problem Description Give you a string with lengt…

地址:http://acm.hdu.edu.cn/showproblem.php?pid=3374 题目: String Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3029    Accepted Submission(s): 1230 Problem Description Give you a string wi…

String Problem Time Limit: 10 Sec  Memory Limit: 64 MB[Submit][Status][Discuss] Description Input Output Sample Input 1 3 135 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 0 0 3 1 0 0 4 0 0 Sample Output 3 HINT Solution 官方题解: 首先将点分为3类 第一类:Pij 表示第i个点和第j个点组合…

layout: post title: Mediocre String Problem (2018南京M,回文+LCP 3×3=9种做法 %%%千年好题 感谢"Grunt"大佬的细心讲解) author: "luowentaoaa" catalog: true mathjax: true tags: - 回文树 - 马拉车 - 扩展KMP - 后缀数组 - 后缀自动机 - 字符串哈希 题意 给出一个串S,和一个串T. 要求 从S串中取一个子串,后面接上T串的一个前缀…

A - Simple String Problem Time Limit:10000MS     Memory Limit:65536KB     64bit IO Format:%lld & %llu  Practice POJ 2236 Description An earthquake takes place in Southeast Asia. The ACM (Asia Cooperated Medical team) have set up a wireless network wi…

Simple String Problem Recently, you have found your interest in string theory. Here is an interesting question about strings. You are given a string S of length n consisting of the first k lowercase letters. You are required to find two non-empty sub…

题目链接:https://vjudge.net/problem/HDU-3374 String Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3646    Accepted Submission(s): 1507 Problem Description Give you a string with length N,…

后缀数组+RMQ+二分 后缀数组二分确定第K不同子串的位置 , 二分LCP确定可选的区间范围 , RMQ求范围内最小的sa Boring String Problem Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 661    Accepted Submission(s): 183 Problem Description In thi…

FZU - 2218Simple String Problem 题目大意:给一个长度为n含有k个不同字母的串,从中挑选出两个连续的子串,要求两个子串中含有不同的字符,问这样的两个子串长度乘积最大是多少? 根据题目所给的k<=16很自然的想到用状压dp来处理,但不知道该dp个什么,在观摩大佬的做法后才明白.我们用0000000000000000到1111111111111111表示pomnlkjhgfedcba的字符存不存在的状态,某个字符存在的话对应位就是1,反之就是0.一开始dp[x]就表示,…

String Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2000    Accepted Submission(s): 875 Problem Description Give you a string with length N, you can generate N strings by left shifts.…

String Problem 题目链接(点击) Boy Valera likes strings. And even more he likes them, when they are identical. That's why in his spare time Valera plays the following game. He takes any two strings, consisting of lower case Latin letters, and tries to make…

题目 Source http://acm.hdu.edu.cn/showproblem.php?pid=5008 Description In this problem, you are given a string s and q queries. For each query, you should answer that when all distinct substrings of string s were sorted lexicographically, which one is…

L - Ferris Wheel String Time Limit: 3000/1000MS (Java/Others)     Memory Limit: 43000/43000KB (Java/Others) Submit Status Have you ever been to London? Our Master Qiu will tell you how amazing in London and how funny a Ferris Wheel String is. One day…

Problem Description In this problem, you are given a string s and q queries. For each query, you should answer that when all distinct substrings of string s were sorted lexicographically, which one is the k-th smallest.  A substring si...j of the str…

Problem Description Give you a string with length N, you can generate N strings by left shifts. For example let consider the string “SKYLONG”, we can generate seven strings:String Rank SKYLONG 1KYLONGS 2YLONGSK 3LONGSKY 4ONGSKYL 5NGSKYLO 6GSKYLON 7an…

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 614    Accepted Submission(s): 282 Problem Description This is a simple problem about string. Now a string S contains only ‘0’-‘9’. ?? wants to s…

Accept: 2    Submit: 16 Time Limit: 2000 mSec    Memory Limit : 32768 KB  Problem Description Recently, you have found your interest in string theory. Here is an interesting question about strings. You are given a string S of length n consisting of t…

Description 题目描述 Recently, you have found your interest in string theory. Here is an interesting question about strings. You are given a string S of length n consisting of the first k lowercase letters. You are required to find two non-empty substrin…