Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example: Given num = 16, return true. Given num = 5, return false. Follow up: Could you solve it without loops/recursion?
class Solution {public: bool isPowerOfFour(int num) { return !(num & num-1) && ((num - 1) % 3 == 0); }};新聞熱點
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