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However, all efforts to decode their messages have failed so far because, as luck would have it, they have stumbled upon a race of stuttering aliens! 阅读全文
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Given two strings a and b we define a*b to be their concatenation. For example, if a = "abc" and b = "def" then a*b = "abcdef". If we think of concate 阅读全文
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The repetition number of a string is defined as the maximum number R such that the string can be partitioned into R same consecutive substrings. For e 阅读全文