lessons learned from wingtip notification project

notification specification might not need graph structure. Mr. Kim implemented it by kind of just linked list mechanism. And he used STL library so, he didn't have to care about the linked list implementation. If he approached it by just static array list, deleting process might take much time. His using STL vector list is probably made as linked list way. Anyway, he has no reason to care about the detailed implementation. The difference is that I have implemented it for myself which causes many problems. 

Anyway, Mr. Kim's way was different from Mr. Jeong's way. Mr. Jeong suggested static array way. That way is possible by self all coding but may take more time than graph or linked list. I think my structure is not graph which was linked list. Just there were many links. Graph has circling relation and multi directions from same point. But in my structure, there's no such logic.