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100题 发题解留念是要求满足k^n=p的那个k 其实不用pow也能求 两边取对数得 n*ln(k)=ln(p) ln(k)=ln(p)/n k=exp(ln(p)/n) 用double就可以 log是一个很好用的东西，有的时候取一下对数就简单多了 Followed by:
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