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摘要： 今天下午航电的比赛，我没注意，下午两点多才来实验室。只是做了几道水题。4229就是给定那个a,b,c,d四个非负整数数，分别用|a-b| |b-c| |c-d| |d-a| 来代替，计算直到 a= = b == c == d为止求出一共需要多少步，这题幸亏给出了It turns out that in all cases, the sequence converges very quickly. In fact, it can be shown that if all four integers are less than 2^n, then it will take no more than 阅读全文