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字符串hash因为如果一个字符串是回文串,那么正着做哈希和反着做哈希结果应该一样.于是我们先正反各做一边哈希.如果判断出来一个字符串是回文穿那么这个字符串的前半部分和后半部分的重数一定相同,于是当前位置的字符串回文重数f[i]就等于f[i/2]+1. #include<cstdio> #include<iostream> #include<cmath> #include<algorithm> #include<cstring> #include&…
Palindromic String Time Limit: 20 Sec  Memory Limit: 256 MB 题目连接 http://acm.uestc.edu.cn/#/contest/show/61 Description 秋实大哥喜欢探索新鲜事物,最近他发明了一种新型回文串,叫K重回文串!今天他想用它来考考小朋友们. 秋实大哥给出了与K重回文串有关的信息 任何字符串都属于0重回文串,包括空字符串.    一个长度为N的字符串S,S是K(k≥1)重回文串,当且仅当S是回文串,且其长…
O(n)的复杂度求回文串:Manacher算法 定义一个回文值,字符串S是K重回文串,当且仅当S是回文串,且其长度为⌊N/2⌋的前缀和长度为⌊N/2⌋的后缀是K−1重回文串 现在给一个2*10^6长度的字符串,求其每个前缀的最大回文值之和. 设dp[i]为长度为i的前缀的最大回文值. 当长度为i的前缀的字符串是回文串的时候,有:dp[i]=dp[i/2]+1 若不是回文串 dp[i]=0 接下来就是怎么样快速的判断回文串了,推荐算法Manacher算法. Manacher算法先对字符串进行修改…
M - Palindromic String Time Limit: 3000/1000MS (Java/Others)     Memory Limit: 128000/128000KB (Java/Others) Submit Status 秋实大哥喜欢探索新鲜事物,最近他发明了一种新型回文串,叫K重回文串!今天他想用它来考考小朋友们. 秋实大哥给出了与K重回文串有关的信息 任何字符串都属于0重回文串,包括空字符串. 一个长度为N的字符串S,S是K(k≥1)重回文串,当且仅当S是回文串,且其…
需求:Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring. 如果一个字符串从左向右写和从右向左写是一样的,这样的字符串就叫做palindromic string 判断回文数,中间开花.定一个中心,向两边散…
A number that will be the same when it is written forwards or backwards is known as a Palindromic Number. For example, 1234321 is a palindromic number. All single digit numbers are palindromic numbers. Non-palindromic numbers can be paired with palin…
转载地址:https://www.cnblogs.com/clnchanpin/p/6880322.html 假设一个字符串从左向右写和从右向左写是一样的,这种字符串就叫做palindromic string.如aba,或者abba.本题是这种,给定输入一个字符串.要求输出一个子串,使得子串是最长的padromic string. 下边提供3种思路 1.两侧比较法 以abba这样一个字符串为例来看,abba中,一共同拥有偶数个字.第1位=倒数第1位.第2位=倒数第2位......第N位=倒数第N…
Victor and String Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 524288/262144 K (Java/Others) Total Submission(s): 163    Accepted Submission(s): 78 Problem Description Victor loves to play with string. He thinks a string is charming as the…
Palindromic Substring Time Limit: 10 Seconds      Memory Limit: 65536 KB In the kingdom of string, people like palindromic strings very much. They like only palindromic strings and dislike all other strings. There is a unified formula to calculate th…
Palindromic Substring Time Limit: 10000ms Memory Limit: 65536KB This problem will be judged on HDU. Original ID: 442664-bit integer IO format: %I64d      Java class name: Main In the kingdom of string, people like palindromic strings very much. They…
Victor and String Time Limit: 1000ms Memory Limit: 262144KB This problem will be judged on HDU. Original ID: 542164-bit integer IO format: %I64d      Java class name: Main Victor loves to play with string. He thinks a string is charming as the string…
假设一个字符串从左向右写和从右向左写是一样的,这种字符串就叫做palindromic string.如aba,或者abba.本题是这种,给定输入一个字符串.要求输出一个子串,使得子串是最长的padromic string. 下边提供3种思路 1.两側比較法 以abba这样一个字符串为例来看,abba中,一共同拥有偶数个字.第1位=倒数第1位.第2位=倒数第2位......第N位=倒数第N位 以aba这样一个字符串为例来看,aba中.一共同拥有奇数个字符.排除掉正中间的那个字符后,第1位=倒数第1…
假设没有操作1,就是裸的回文串自己主动机...... 能够从头部插入字符的回文串自己主动机,维护两个last点就好了..... 当整个串都是回文串的时候把两个last统一一下 Victor and String Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 524288/262144 K (Java/Others) Total Submission(s): 30    Accepted Submission(s): 9 Probl…
两道差不多的题,都是回文自动机right集合处理相关. Victor and String Victor loves to play with string. He thinks a string is charming as the string is a palindromic string. Victor wants to play n times. Each time he will do one of following four operations. add a char c to…
xiaoxin juju needs help 题意:给你一个字符串,求打乱字符后,有多少种回文串.                      (题于文末) 知识点: n个元素,其中a1,a2,····,an互不相同,进行全排列,可得n!个不同的排列. 若其中某一元素ai重复了ni次,全排列出来必有重复元素,其中真正不同的排列数应为 ,即其重复度为ni! 同理a1重复了n1次,a2重复了n2次,····,ak重复了nk次,n1+n2+····+nk=n. 对于这样的n个元素进行全排列,可得不同排…
HDU   3294 Problem Description One day, sailormoon girls are so delighted that they intend to research about palindromic strings. Operation contains two steps:First step: girls will write a long string (only contains lower case) on the paper. For exa…
xiaoxin juju needs helpTime Limit: 1000MS Memory Limit: 65536KB 64bit IO Format: %I64d & %I64uSubmit Status DescriptionAs we all known, xiaoxin is a brilliant coder. He knew **palindromic** strings when he was only a six grade student at elementry sc…
Girls' research Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others)Total Submission(s): 537    Accepted Submission(s): 199 Problem Description One day, sailormoon girls are so delighted that they intend to research abo…
Keep On Movin Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 76    Accepted Submission(s): 68 Problem Description Professor Zhang has kinds of characters and the quantity of the i-th character…
Keep On Movin 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5744 Description Professor Zhang has kinds of characters and the quantity of the i-th character is ai. Professor Zhang wants to use all the characters build several palindromic strings. He…
Girls' research Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others) Total Submission(s): 1160    Accepted Submission(s): 448 Problem Description One day, sailormoon girls are so delighted that they intend to research a…
Problem Description Professor Zhang has kinds of characters and the quantity of the i-th character is ai. Professor Zhang wants to use all the characters build several palindromic strings. He also wants to maximize the length of the shortest palindro…
A. Quasi-palindrome time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Let quasi-palindromic number be such number that adding some leading zeros (possible none) to it produces a palindromic s…
Description Let quasi-palindromic number be such number that adding some leading zeros (possible none) to it produces a palindromic string. String t is called a palindrome, if it reads the same from left to right and from right to left. For example,…
Problem Description One day, sailormoon girls are so delighted that they intend to research about palindromic strings. Operation contains two steps:First step: girls will write a long string (only contains lower case) on the paper. For example, "abcd…
Girls' researchTime Limit: 3000/1000 MS (Java/Others) Memory Limit: 65535/32768 K (Java/Others)Total Submission(s): 4401 Accepted Submission(s): 1642 Problem Description One day, sailormoon girls are so delighted that they intend to research about pa…
万事总要有个开头,来吧. 问题原题看情况,如果我能用中文准确地表述出来的话那就用中文说一下.也有可能完全不说… ■ twoSum 问题: 参数是一个数组nums和一个目标数target,寻找nums中两个数的和是target,返回这两个数的下标.同一个数不能重复使用.假设只有一个正确的解. 注意点: 由于同一个数不能重复使用,用掉一个数之后这个数就不能再计入使用范围.但同时也要注意[3,3] 6这种情况,即同一个数不能用两次,但是要考虑有两个相同值的数 朴素解法: def sumTwo(nums…
A - Acperience HDU - 5734 题意: 给你一个加权向量,需要我们找到一个二进制向量和一个比例因子α,使得|W-αB|的平方最小,而B的取值为+1,-1,我们首先可以想到α为输入数据的平均值,考虑到是平方和,然后化简表达式,可以得到一个化简的式子,用n通分,可以做到没有除法,然后分子分母化简到互质. #define _CRT_SECURE_NO_WARNINGS #include<cstdio> #include<cstring> #include<iom…
回文串 回文串(palindromic string)是指这个字符串无论从左读还是从右读,所读的顺序是一样的:简而言之,回文串是左右对称的.一般求解一个字符串的最长回文子串问题. problem:Longest Palindromic Substring 参考 1.LongestPalindromicSubstring: 完…
One day, sailormoon girls are so delighted that they intend to research about palindromic strings. Operation contains two steps:First step: girls will write a long string (only contains lower case) on the paper. For example, "abcde", but 'a' ins…