LeetCode(326) Power of Three
題目
Given an integer, write a function to determine if it is a power of three.分析
本題判斷給定一個整數是否為3的整次冪,不可用遞迴和迴圈。
32bit表示的int,3的整次冪最大數為1162261467,所以只需判斷給定整數n能否被該最大數整除即可。
程式碼
class Solution { public: bool isPowerOfThree(int n) { return n > 0 && 1162261467 % n == 0; } };
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