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题目描述Little John is playing very funny game with his younger brother. There is one big box filled with M&Ms of different colors. At first John has to e... 阅读全文
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Problem DescriptionThe digital root of a positive integer is found by summing the digits of the integer. If the resulting value is a single digit then... 阅读全文
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DescriptionSevere acute respiratory syndrome (SARS), an atypical pneumonia of unknown aetiology, was recognized as a global threat in mid-March 2003. ... 阅读全文
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DescriptionThere are so many different religions in the world today that it is difficult to keep track of them all. You are interested in finding out ... 阅读全文