摘要：
There is a straight snowy road, divided into n blocks. The blocks are numbered from 1 to n from left to right. If one moves from the i-th block to the 阅读全文
posted @ 2017-07-29 23:55
天之道，利而不害
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摘要：
Petya loves lucky numbers. Everybody knows that positive integers are lucky if their decimal representation doesn't contain digits other than 4 and 7. 阅读全文
posted @ 2017-07-29 23:52
天之道，利而不害
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