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As early as 2005, several gambling groups discovered a defect of WinFall lottery system: when the accumulated bonus is divided equally among all participants, you can earn an average of .3 for every lottery ticket you buy. Every time the pool exceeds 2 million US dollars, this so-called "roll-down" split occurs.The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows:咳咳。It looks very happy. 233　　罗马浴场作者跨越时空的奇迹喜剧，在此开幕─！Don't get down on the slightest thing. You are only in your twenties. What are you afraid of?To get back to the point, At this time, I saw Zhang Xiaobo's expression was in high spirits. He was obviously very proud and relieved of his hatred for beating up the "killer bee" with the flickering armor-piercing bullet. Associated with his slightly melancholy expression just now, it was obviously not this one that made him melancholy. I was not the kind of person who liked to expose people's scars, but for work reasons, I still had to ask: