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3的幂 #29

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Aras-ax opened this issue Apr 4, 2019 · 0 comments

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Aras-ax commented Apr 4, 2019 •

edited

给定一个整数，编写一个函数来判断它是否是 3 的幂次方。

示例 1:

输入: 1
输出: true
解释: 3^0 = 1

示例 2:

输入: 27
输出: true
解释: 3^3 = 27

示例 3:

输入: 218
输出: false

解答

function isPowerOfThree(num) {
    if (num >= 1) {
        return num === 1 || (num % 3 === 0 && isPowerOfThree(num / 3));
    }
    return false;
}

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