leetcode 342. Power of Four
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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 & 1431655765) && ((num&num-1)==0); }}; 0 0
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