摘要：
A number whose only prime factors are 2,3,5 or 7 is called a humble number. The sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24 阅读全文
posted @ 2017-08-08 15:10
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摘要：
JGShining's kingdom consists of 2n(n is no more than 500,000) small cities which are located in two parallel lines. Half of these cities are rich in r 阅读全文
posted @ 2017-08-08 14:32
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