: For the following scenarios choose the best data structure or a combination of data structures. Justify your answer briefly and write code of the structure you choose (Points: 8)

1. Suppose the grocery store decided that the customer who come first will be served first
2. A list must also be maintained to access any customer randomly
3. The size of file is unknown the entries need to be entered as they come. The structure must have flexible memory management
4. CODE MUST IN C++., topic(data structure and algorithms