摘要：
Bob has a not even coin（就是一个不均匀的硬币，朝上的概率不一定是1/2）, every time he tosses the coin, the probability that the coin's front face up is q/p(q/p<=1/2). The q 阅读全文
posted @ 2017-09-17 09:37
╰追憶似水年華ぃ╮
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摘要：
限制：1000ms 32768K Define the function S(x) for xx is a positive integer. S(x) equals to the sum of all digit of the decimal expression of x. Please fin 阅读全文
posted @ 2017-09-17 08:24
╰追憶似水年華ぃ╮
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