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A: Secret of Chocolate Poles 题目描述 Wendy, the master of a chocolate shop, is thinking of displaying poles of chocolate disks in the showcase. She can u 阅读全文
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A: Alien Sunset 题目描述 Following tremendous advances in space flight control software and equally impressive innova- tions in reality TV crowdfunding, h 阅读全文
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题目描述 Alice and Bob are playing a simple game. They line up a row of n identical coins, all with the heads facing down onto the table and the tails upw 阅读全文