这是我们实习时编的，实现了基本的功能，如插入，删除，查找等。初学
C++的同志们可以参考：）-This is our attachments series to achieve the basic functions, such as inserting, deleting, and searching. Novice C comrades can reference :)
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double list node.cpp node.h dlist.h manager.cpp manager.h main.cpp dlist.cpp
