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ACM的一道题--Parenthesize the string
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上传时间: 2010-01-23
详细说明: Parenthesize the string。 Description Let us define a multiplication operation on three symbols a,b,c according to the following table; thus ab = b, ba = c, and so on. Notice that the multiplication operation defined by the table is neither associative nor commutative. a b c a b b a b c b a c a c c Find an efficient algorithm that examines a string of these symbols, say bbbbac, and decides whether or not it is possible to parenthesize the string in such a way that the value of the resulting expression is a. For exampl e , on input bbbbac your algorithm should return yes because ((b(bb))(ba))c = a. Input Line 1: number K (1 <= K <= 100) Line 2 … K+1: each of them is a test string. Output Line 1 … K : For each test case, output Yes or No. Sample Input 2 bbbbac abb Sample Output Yes No ...展开收缩
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