摘要：
All bus tickets in Berland have their numbers. A number consists of n digits (n is even). Only k decimal digits d1,d2,…,dk can be used to form ticket 阅读全文
posted @ 2018-12-29 10:58
nimphy
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摘要：
Vasya is preparing a contest, and now he has written a statement for an easy problem. The statement is a string of length n consisting of lowercase La 阅读全文
posted @ 2018-12-29 10:49
nimphy
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