计算乘方是有快速算法的，并不是一个一个蛮力乘上去的。比如想算2^10000，计算机先算2^5000，再算一次平方，即两个数的乘法。而为了计算2^5000，计算机会先算2^2500再算一次平方。这个算法叫快速幂算法，对于2^N的计算，如果认为每次乘法的时间复杂度是O(1)的 ...

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