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请教一道简单数学题

Posted by rhbc73 at 2009-12-18 14:00:05
刚开始学习
大虾指教阿

求 n^n 结果的个位数值

既然输入是n,我自然就想到一个复杂度为n的方法, 直接把n的个位相乘n次结果就出来了(n的高位不会影响最后结果的个位)

但肯定还有更见的有效的方法吧

1-9的n次 我写了下,个位其实是有规律的,但是能用公式表达出来吗?

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