说明：  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 seen h is friend in a queue, then it is very much likely that this lucky guy mi ght 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 si mulates such a queue with people jumping in ever y now and then, assume that, if one in the queue has several friends asking az r favors. he would arrange their requests in a queue of his own)