leetcode:693

program8.py

class Solution:
    def hasAlternatingBits(self, n: int) -> bool:
        st=''
        while(n>0):
            st+=str(n%2)
            n=n//2
        for i in range(len(st)-1):
            if(st[i]==st[i+1]):
                return False
        else:
            return True