题意: 判断是否能将字符串S分成三段非空回文串. 思路: 先预处理出前缀回文串和后缀回文串的位置,将位置分别装入两个集合中,O(n). 针对每个前缀回文串的终点位置,挑出不相交的后缀回文串,对中间那段进行暴力匹配即可.只有20个case,不会超时的. 具体的算法参考HIHOCODER HIHO一下 第一周 #1032 : 最长回文子串 (特殊处理) //#include <bits/stdc++.h> #include <cstdio> #include <cstring&g…

http://acm.hdu.edu.cn/showproblem.php?pid=5340 题意 判断是否能将字符串S分成三段非空回文串 分析 manacher预处理出前缀和后缀回文的位置, 枚举第一个回文串和第三个回文串,这样得到第二个回文串的区间,找中点,因为manacher处理后所有的回文串长度都是奇数,然后根据中点的回文半径判断中间部分是否回文即可, 复杂度o(n2).至于n2复杂度为什么能水过去..不是很懂 #include<iostream> #include<cmath&…

Three Palindromes Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1244    Accepted Submission(s): 415 Problem Description Can we divided a given string S into three nonempty palindromes?   Input…

[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<…

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HDU 1711 Number Sequence(数列) Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) [Description] [题目描述] Given two sequences of numbers : a[1], a[2], ...... , a[N], and b[1], b[2], ...... , b[M] (1 <= M <= 10000, 1 <= N…

HDU 1005 Number Sequence(数列) Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) [Description] [题目描述] A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. Given A, B, an…

LightOJ 1033  Generating Palindromes(dp) 题目链接:http://acm.hust.edu.cn/vjudge/contest/view.action?cid=87730#problem/A 题目: Description By definition palindrome is a string which is not changed when reversed. "MADAM" is a nice example of palindrome.…

HDU 1176 免费馅饼 (动态规划) Description 都说天上不会掉馅饼,但有一天gameboy正走在回家的小径上,忽然天上掉下大把大把的馅饼.说来gameboy的人品实在是太好了,这馅饼别处都不掉,就掉落在他身旁的10米范围内.馅饼如果掉在了地上当然就不能吃了,所以gameboy马上卸下身上的背包去接.但由于小径两侧都不能站人,所以他只能在小径上接.由于gameboy平时老呆在房间里玩游戏,虽然在游戏中是个身手敏捷的高手,但在现实中运动神经特别迟钝,每秒种只有在移动不超过一米的范围…