693. Binary Number with Alternating Bits

Easy
​
Given a positive integer, check whether it has alternating bits: namely, if two adjacent bits will always have different values.
Example 1:
Input: n = 5
Output:
true
Explanation:
The binary representation of 5 is: 101
Example 2:
Input: n = 7
Output:
false
Explanation:
The binary representation of 7 is: 111.
Example 3:
Input: n = 11
Output:
false
Explanation:
The binary representation of 11 is: 1011.
Constraints:
  • 1 <= n <= 231 - 1

解題

func hasAlternatingBits(n int) bool {
for n > 0 {
if n%2 == (n>>1)&1 { return false }
n = n >> 1
}
return true
}