Tree vs Array vs Linked List When Hierarchy Matters in DSA Typescript - Key Differences

Recall & Review

beginner

What is a key feature of a tree data structure?

A tree organizes data in a hierarchy with a root node and child nodes, showing parent-child relationships clearly.

beginner

How does an array store data compared to a tree?

An array stores data in a flat, linear order without hierarchy, using indexes to access elements directly.

beginner

What is the main difference between a linked list and an array?

A linked list stores elements in nodes connected by pointers, allowing dynamic size and easy insertion/removal, unlike fixed-size arrays.

intermediate

Why is a tree preferred when hierarchy matters?

Because trees represent parent-child relationships naturally, making it easy to model structures like file systems or organization charts.

intermediate

Can an array represent hierarchical data effectively? Why or why not?

Arrays can store hierarchical data but do not show relationships clearly; extra logic is needed to interpret hierarchy, unlike trees.

Which data structure naturally shows parent-child relationships?

A Stack

B Tree

C Linked List

D Array

Trees organize data in a hierarchy with clear parent-child links.

Which data structure allows dynamic size and easy insertion/removal?

A Linked List

B Array

C Tree

D Queue

Linked lists use pointers to connect nodes, allowing flexible size and easy changes.

What is a limitation of using arrays for hierarchical data?

A Fixed size and no direct parent-child links

B Too slow to access elements

C Uses too much memory

D Cannot store numbers

Arrays store data linearly and do not show hierarchy without extra logic.

Which data structure is best for representing a file system hierarchy?

A Hash Table

B Linked List

C Array

D Tree

Trees naturally model hierarchical structures like file systems.

In a linked list, how are elements connected?

A By indexes

B By keys

C By pointers or references

D By values

Linked list nodes hold pointers to the next node, linking elements dynamically.

Explain when and why you would choose a tree over an array or linked list for storing data.

Think about how data is connected and what structure shows relationships clearly.

Describe the main differences between arrays, linked lists, and trees in terms of structure and use cases.

Consider how data is stored and accessed in each structure.