读题,我们知道选1个.选2个的时候是没有冲突的,大于2个的时候就有限制,那么我们观察是否可以把大于2个的情况都转换一下,可以发现,如果有一个串的长度大于2,且出现的次数大于2,那么,组成这个串里必定有一个长度为2的串,出现的次数大于2,那我们就可以把所有大于2的长度转换为长度为2的,这样题目转换成长度为1与长度为2的最大值,复杂度就是O(26*|s|),一般字符串dp都要考虑26个字母 #include<bits/stdc++.h> using namespace std; #define l…

Bessie the cow has just intercepted a text that Farmer John sent to Burger Queen! However, Bessie is sure that there is a secret message hidden inside. The text is a string ss of lowercase Latin letters. She considers a string tt as hidden in string…

思路对了,但是不会写. 等差数列长度不是1就是2,所以不是一个字母就是俩字母,一开始写的时候直接枚举两个字母,然后让次数相乘.这样是不对的,比如abaabb,字母ab的个数应该是3+2+2,因该是每一个a后边b的个数然后相加. 正解:维护一个二位数组dp[i][j],表示位置后边,字符j的个数,然后枚举两个字符k和j,当位置i是字符k时,直接相加,当长度为1时,答案为x*(x-1)/2 #include<bits/stdc++.h> using namespace std; typedef l…

---------------  VM Arguments---------------  jvm_args: -Dosgi.requiredJavaVersion=1.6 -Dhelp.lucene.tokenizer=standard -Xms40m -Xmx256m -XX:MaxPermSize=128m java_command: <unknown>java_class_path (initial): C:\e\eclipse4.2\\plugins/org.eclipse.equi…

The Cow Lexicon Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 9041   Accepted: 4293 Description Few know that the cows have their own dictionary with W (1 ≤ W ≤ 600) words, each containing no more 25 of the characters 'a'..'z'. Their c…

又见面了,还是原来的配方,还是熟悉的DP....直接秒了... The Cow Lexicon Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 7316 Accepted: 3421 Description Few know that the cows have their own dictionary with W (1 ≤ W ≤ 600) words, each containing no more 25 of the…

http://poj.org/problem?id=3267 The Cow Lexicon Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 9380   Accepted: 4469 Description Few know that the cows have their own dictionary with W (1 ≤ W ≤ 600) words, each containing no more 25 of t…

The Cow Lexicon Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 8815 Accepted: 4162 Description Few know that the cows have their own dictionary with W (1 ≤ W ≤ 600) words, each containing no more 25 of the characters 'a'..'z'. Their cowmu…

The Cow Lexicon Time Limit : 4000/2000ms (Java/Other)   Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 16   Accepted Submission(s) : 10 Problem Description Few know that the cows have their own dictionary with W (1 ≤ W ≤ 600) words,…

The Cow Lexicon DescriptionFew know that the cows have their own dictionary with W (1 ≤ W ≤ 600) words, each containing no more 25 of the characters 'a'..'z'. Their cowmunication system, based on mooing, is not very accurate; sometimes they hear word…