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Description Description We know that if a phone number A is another phone number B’s prefix, B is not able to be called. For an example, A is 123 whil 阅读全文
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Description Description Contest time again! How excited it is to see balloons floating around. But to tell you a secret, the judges' favorite time is 阅读全文
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Description Description Given a string containing only 'A' - 'Z', we could encode it using the following method: 1. Each sub-string containing k same 阅读全文
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Description Description We all use cell phone today. And we must be familiar with the intelligent English input method on the cell phone. To be specif 阅读全文