Time Limit: 1000ms
Memory Limit: 32768KB
This problem will be judged on HDU. Original ID: 4821
64-bit integer IO format: %I64d Java class name: Main
Given a string S and two integers L and M, we consider a substring of S as “recoverable” if and only if
(i) It is of length M*L;
(ii) It can be constructed by concatenating M “diversified” substrings of S, where each of these substrings has length L; two strings are considered as “diversified” if they don’t have the same character for every position.
Two substrings of S are considered as “different” if they are cut from different part of S. For example, string "aa" has 3 different substrings "aa", "a" and "a".
Your task is to calculate the number of different “recoverable” substrings of S.
The input contains multiple test cases, proceeding to the End of File.
The first line of each test case has two space-separated integers M and L.
The second ine of each test case has a string S, which consists of only lowercase letters.
The length of S is not larger than 10^5, and 1 ≤ M * L ≤ the length of S.
For each test case, output the answer in a single line.
2013 Asia Regional Changchun
解題：字元串hash+map
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