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DescriptionA ring is compose of n circles as shown in diagram. Put natural number 1, 2, ..., n into each circle separately, and the sum of numbers in ... 阅读全文
posted @ 2015-08-02 17:52
pb2016
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DescriptionThe doggie found a bone in an ancient maze, which fascinated him a lot. However, when he picked it up, the maze began to shake, and the dog... 阅读全文
posted @ 2015-08-02 17:27
pb2016
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