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Max answer Alice has a magic array. She suggests that the value of a interval is equal to the sum of the values in the interval, multiplied by the sma 阅读全文
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Distance on the tree DSM(Data Structure Master) once learned about tree when he was preparing for NOIP(National Olympiad in Informatics in Provinces) 阅读全文
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P2894 [USACO08FEB]酒店Hotel 题目描述 The cows are journeying north to Thunder Bay in Canada to gain cultural enrichment and enjoy a vacation on the sunny sh 阅读全文