Suggest a suitable combination of array and hashmap to design the underlying data structures behind an educational institution’s website. The website supports selection of a particular department, a particular course in the department, a particular student in the course

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A combination of array and hashmap can be used to design the underlying data structures for an educational institution's website.

Use an array to store the departments available in the institution.
Each department can be represented as a key in the hashmap.
The value corresponding to each department key in the hashmap can be another hashmap.
This nested hashmap can store the courses available in the department.
The courses can be represented as keys in the nested hashmap.
The value corresponding to each course key can be an array of students enrolled in the course.

Suggest a suitable combination of array and hashmap to design the underlying data structures behind an educational institution’s website. The website supports selection of a particular department, a particular course in the department, a particular student in the course

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