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given an integer,write a function to determine if it is a power of three.
class Solution { public: bool isPowerOfThree(int n) { if(n<1) return false; else if(n==1) return true; else return n%3==0&&isPowerOfThree(n/3); } };
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原文地址：http://www.cnblogs.com/xiaoying1245970347/p/5114192.html
