Now, instead of using 2D, we will use doubly-linked lists to present sparse matrices. There are various methods of organizing doubly-linked-lists. We not only store elements of sparse matrices but also implement operations such as addition, subtraction, multiplication and so on. It means that we have to find out the suitable method of organization for storing and accessing data. The first type of organization I would like to show here is: We can make up a linked list of linked lists. Here is a picture of the linked structure: Additional information would be needed to be stored for the size of the matrix. It could be larger than 3 rows and 4 columns, but any additional rows and columns are all zeros. We will use two types of node objects:

NEW_PRO.CPP

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