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Now you are back,and have a task to do: Given you a string s consist of lower-case English letters only,denote f(s) as the number of distinct sub-stri 阅读全文
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Good Article Good sentence In middle school, teachers used to encourage us to pick up pretty sentences so that we could apply those sentences in our o 阅读全文
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Little Daniel loves to play with strings! He always finds different ways to have fun with strings! Knowing that, his friend Kinan decided to test his 阅读全文
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You are given a string S which consists of 250000 lowercase latin letters at most. We define F(x) as the maximal number of times that some string with 阅读全文
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A string is finite sequence of characters over a non-empty finite set Σ. In this problem, Σ is the set of lowercase letters. Substring, also called fa 阅读全文