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同学会上，完治与老同学关口里美（有森也实饰）、三上健一（江口洋介饰）相遇。完治发现自己暗恋的里美在与好友三上交往，苦闷的他不知道，三上只是怀着玩的心态与里美交往，实际上三上喜欢的是医学院的女学生长崎尚子（千堂あきほ饰）。然而尹旭并不知道，远处的树林一直有几双眼睛盯着茅屋，一个个目光凌厉，手按剑柄不曾放松一刻。《山河》的故事发生在1999年的一个秋天，地点选在山西煤矿地区，赵涛饰演的女主角是一名小学老师，他和一个煤矿工作者相爱，但很快分手，嫁给了煤矿主，从此前男友远走他乡。山上声音就大起来，叫喊声，夹着笑闹声，还有狗儿兴奋的狂吠声，此起彼伏。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.