When storing data, not only should we store the value of the data element, but what else should be stored?
When storing data, not only the values of data elements must be stored, but also the "relationships between data elements".
The essence of a data structure is a collection of data elements that have various specific relationships with each other.
Data elements are the basic units of data. According to the different characteristics of the relationship between data elements, it can be divided into four basic structures: set, linear structure, tree structure, graph or network structure.
When storing data, it is usually necessary to store not only the values of data elements, but also the relationships between elements.
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