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There arenpeople andmpairs of friends. For every pair of friends, they can choose to become online friends (communicating using online applications) o... 阅读全文
posted @ 2015-07-23 21:12
Painting、时光
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Gerald got a very curious hexagon for his birthday. The boy found out that all the angles of the hexagon are equal to. Then he measured the length of ... 阅读全文
posted @ 2015-07-23 09:46
Painting、时光
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Today on a lecture about strings Gerald learned a new definition of string equivalency. Two stringsaandbof equal length are calledequivalentin one of ... 阅读全文
posted @ 2015-07-23 09:43
Painting、时光
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