vip未注册域名

class DomainRegistrar:
    def __init__(self):
        self.domains = set()
        self.vip_users = set()

    def register_vip(self, user):
        self.vip_users.add(user)

    def register_domain(self, user, domain):
        if domain in self.domains:
            return f"Domain {domain} is already registered."
        if user in self.vip_users or not self.domains:
            self.domains.add(domain)
            return f"Domain {domain} registered successfully for {user}."
        else:
            return f"Domain {domain} is available but not registered for {user} due to non-VIP status."

# 示例使用
registrar = DomainRegistrar()
registrar.register_vip("VIPUser1")
print(registrar.register_domain("VIPUser1", "example.com"))  # VIP用户注册成功
print(registrar.register_domain("RegularUser", "example.com"))  # 普通用户注册失败