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题目: Description standard input/outputStatements Little Liesbeth likes to play with strings. Initially she got a string of length n, consisting of lett 阅读全文
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Sn=a1*(1-q^n)/(1-q),枚举q的值,判断a1是否为整数,比较暴力 阅读全文
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水 阅读全文
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map+暴力 阅读全文