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Clairewd’s message HDU - 4300 Clairewd is a member of FBI. After several years concealing in BUPT, she intercepted some important messages and she was preparing for sending it to ykwd. They ha

Revolving Digits HDU - 4333 One day Silence is interested in revolving the digits of a positive integer. In the revolving operation, he can put several last digits to the front of the integer.