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Each replacement must be completed within 20 seconds, and the number of substitutions is not limited. The time for exchanging players is when someone fouls, fights for the ball, calls for a pause, etc. The referee may temporarily suspend the timing of the match. 　　? Generally speaking, design patterns are divided into three categories:9-14 Dice: The module random contains functions that generate random numbers in various ways, where random () returns an integer within the specified range. For example, the following code returns an integer within 1-6:故事主人翁市之宫行是企业社长的儿子，时刻准备着继承那间世界顶尖的家族企业。从年幼的时候开始，父亲就告诉他“不欠人，不求人”的道理，生活时时遵守家训。可是，在一次意外溺水，行被住在桥下荒川钓鱼的小珊救回性命，就此欠下救命之恩。为了报恩，小珊要求行跟她谈恋爱，永远在一起。行碍于家训惟有答应，自己也开始在桥下生活。不过，荒川这地方远比市之宫行想像更为怪异，大部分居民正是被社会认定为带着疯狂幻想的“电波族”……我做的过来。The disadvantage of state mode is that many state classes will be defined in the system. Writing 20 state classes is a boring job, and many objects will be added to the system. In addition, because the logic is scattered in the state class, although unpopular conditional branch statements are avoided, it also causes the problem of logic dispersion, and the logic of the entire state machine cannot be seen in one place.