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// @Title: 交替位二进制数 (Binary Number with Alternating Bits)
// @Author: 15816537946@163.com
// @Date: 2022-03-28 23:15:37
// @Runtime: 0 ms
// @Memory: 1.9 MB
func hasAlternatingBits(n int) bool {
    a := n ^ n>>1
    return a&(a+1) == 0
}