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For a positive integer N , the digit sum of N is defined as the sum of N itself and its digits. When M is the digitsum of N , we call N a generator of 阅读全文
posted @ 2016-08-29 09:22
lateral
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An organic compound is any member of a large class of chemical compounds whose molecules contain carbon. The molar mass of an organic compound is the 阅读全文
posted @ 2016-08-29 09:21
lateral
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You have devised a new encryption technique which encodes a message by inserting between its characters randomly generated strings in a clever way. Be 阅读全文
posted @ 2016-08-29 09:19
lateral
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