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 concatenation as multiplication, exponentiation by a non-negative integer is defined in the normal way: a^0 = "" (the empty string) and a^(n+1) = a*(a^n).Given two strings a and b we define a*b to
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Power Strings POJ - 2406 （KMP找循环节）_Top_Spirit的博客
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