C++电梯服务程序，里面包括了先来先服务策略和顺便服务策略，并实现了mfc图形化界面，可以看到电梯运行过程和策略判定-C++ elevator service program, which includes a first-come first-served policy and the way services strategy, and realized mfc graphical interface, you can see the running processes and strate