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Questions and Answers
Which data structure allows elements to be added and removed from the same end?
Which data structure allows elements to be added and removed from the same end?
- Stack (correct)
- Queue
- Linked List
- Array
What characteristic distinguishes a queue from other data structures?
What characteristic distinguishes a queue from other data structures?
- It has a parent and child hierarchy.
- It uses linked nodes to store data.
- It operates on a Last-In, First-Out basis.
- It follows the First-In, First-Out principle. (correct)
In which data structure is each element called a node that contains data and a pointer to the next node?
In which data structure is each element called a node that contains data and a pointer to the next node?
- Linked List (correct)
- Array
- Graph
- Queue
What is the primary use case of a trie data structure?
What is the primary use case of a trie data structure?
Which data structure is characterized by having a root node and branches leading to leaf nodes?
Which data structure is characterized by having a root node and branches leading to leaf nodes?
Flashcards
Array Definition
Array Definition
An ordered collection of elements, all of the same data type, stored in consecutive memory locations.
Linked List Definition
Linked List Definition
A linear data structure where elements are linked together, with each element (node) holding data and a pointer to the next element.
Queue Definition
Queue Definition
FIFO (First-In, First-Out) data structure; elements enter at the rear and exit at the front.
Stack Definition
Stack Definition
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Graph Definition
Graph Definition
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Study Notes
Data Structures
- Array: A data structure holding a group of elements, typically all the same data type (e.g., integers, strings). An example array of size 4 containing elements (1, 2, 3, and 4) would appear as 1 2 3 4.
Stack
- Stack: A data structure for storing a collection of objects. Items are added/removed using a "push" operation. The last item added is the first removed ("Last-In, First-Out" - LIFO). A stack with elements (1, 2, 3) with 3 at the top will remove 3 first.
Queue
- Queue: A linear data structure storing elements sequentially. Elements are added at the "back", and removed from the "front" ("First-In, First-Out" - FIFO). An example queue with elements (1, 2, 3, 4), 1 is at the front and removed first.
Linked List
- Linked List: A chain of nodes. Each node contains data and a pointer to the next node. It's visualised as a series of nodes connected via pointers. The head node points to the first node, and the last node points to null.
Graph
- Graph: A network of connected nodes (called vertices). Connections are called edges.
Tree
- Tree: A hierarchical data structure with nodes and connections called edges. Nodes can be categorized as root(top), parent, child, leaf (end), and sibling (same level). Example tree with nodes (1, 2, 3, 4, 6, 7), 1 is the root, and 6 and 7 are leaves
Trie
- Trie: Used for fast retrieval, often in dictionaries, auto-suggestions, and IP routing. It's a tree-like structure
Hash
- Hash: A process for uniquely identifying and storing objects. Objects are stored at a pre-calculated index (key). Example hash would be 3
, 16 , 17 .
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