HDU 5842 Lweb and String (水题)
Lweb and String
题目链接:
http://acm.hdu.edu.cn/showproblem.php?pid=5842
Description
Lweb has a string S. Oneday, he decided to transform this string to a new sequence. You need help him determine this transformation to get a sequence which has the longest LIS(Strictly Increasing). You need transform every letter in this string to a new number. A is the set of letters of S, B is the set of natural numbers. Every injection f:A→B can be treat as an legal transformation. For example, a String “aabc”, A={a,b,c}, and you can transform it to “1 1 2 3”, and the LIS of the new sequence is 3. Now help Lweb, find the longest LIS which you can obtain from S. LIS: Longest Increasing Subsequence. (https://en.wikipedia.org/wiki/Longest_increasing_subsequence)Input
The first line of the input contains the only integer T,(1≤T≤20). Then T lines follow, the i-th line contains a string S only containing the lowercase letters, the length of S will not exceed 105.Output
For each test case, output a single line "Case #x: y", where x is the case number, starting from 1. And y is the answer.Sample Input
2 aabcc acdeaaSample Output
Case #1: 3 Case #2: 4Source
2016中国大学生程序设计竞赛 - 网络选拔赛##题意: 给出一个字符串,确定一组字符到自然数的一一映射. 使得结果数串的严格LIS最大.
##题解: 由于字符串中仅含小写字母,那么结果最大就是26. 所以字符串中有多少个不同的字符,结果就是多少.
##代码: ``` cpp #include