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皇帝追问，孰忠孰奸？神仙答：知者自裁In addition to solving the port problem of A, the serial number problem also needs to be paid attention to. The serial number corresponds to the sliding window. The fake TCP packet needs to be filled with the serial number. If the value of the serial number is not in the sliding window of B when it is sent to B before A, B will actively discard it. So we need to find the serial number that can fall into the sliding window between AB at that time. This can be solved violently, because the length of a sequence is 32 bits, and the value range is 0-4294967296. If the window size is like 65535 under Windows I caught in the above figure, I only need to divide, and I know that at most I only need to send 65537 (4294967296/65535=65537) packets to have a sequence number fall into the sliding window. The desired value can be calculated quickly by exhaustion on multiple control hosts.这是一部视角独特、故事情节高潮迭起的家庭情感悬疑剧。 　　一场没有硝烟的情感战争，突然降临在一个夫妻双双同样都是著名主持人的完美家庭！一个痴情的美貌女子，暗恋一个成功的男人，不惜以保姆的身份打入其家庭，最后演绎成了疯狂的极度纠缠！一个同样痴情的富有男子，面对已成为著名主持人的昔日中学时代的暗恋偶像，同样以极度的手段展开了疯狂的追逐！陷入疯狂的女第三者要杀死自己的爱情障碍，可偏偏这“爱情障碍”却是男第三者要视死捍卫的，两个第三者之间又展开了惊魂的极度纠缠！ 　　观赏此剧时，您会不断地想起一句中国成语——什么叫“螳螂捕蝉，黄雀在后” ！ 　　凡是以不道德的手段做非分之举，最终是要付出惨重代价的。当恶梦逝去，一个原本完美的家庭又回复如初时，您会感受到人生的一种超越，还有本剧创作者的一份沉甸甸的社会责任感。1990 奥斯卡奖 最佳编剧 　　One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.So this ford's second attack is