Java/342. Power of Four 4的幂

题目

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代码部分（5ms 88.37%）

class Solution {
    public boolean isPowerOfFour(int num) {
        if(num <= 0) return false;
        
        int count = 1;
        
        for(int i = 0; i <= 15; i ++){
            if(num == count) return true;
            count *= 4;
        }
        
        return false;
    }
}