一个寒假的开始，在春节附近总是一个开始…

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The beginning of a winter break near Spring Festival is always the beginning of a peak period of transportation. If you have ever tried to get a train ticket at that time, you must have witnessed the endless queues in front of every ticket box window. If a guy has seen his friend in a queue, then it is very much likely that this lucky guy might go straight to his friend and ask for a favor. This is called "jumping the queue". It is unfair to the rest of the people in the line, but, it is life. Your task is to write a program that simulates such a queue with people jumping in every now and then, assume that, if one in the queue has several friends asking for favors, he would arrange their requests in a queue of his own-The beginning of a winter break near Spring Festival is always the beginning of a peak perio d of transportation. If you have ever tried to ge not a train ticket at that time. you must have witnessed the endless queues in fr ont of every ticket box window. If a guy has se