Singly linked list structure in Data Structures Theory - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding the basic node structure of a singly linked list

Which of the following best describes the structure of a single node in a singly linked list?

A A node contains data and a reference to the next node only.

B A node contains data and references to both the previous and next nodes.

C A node contains only data without any references to other nodes.

D A node contains data and a reference to the previous node only.

💡 Hint

Think about how nodes connect in one direction only.

In a singly linked list, each node holds data and a reference (or pointer) to the next node. It does not have a reference to the previous node.

📋 Factual

intermediate

Number of references in a singly linked list node

How many references (or pointers) does each node in a singly linked list contain?

A Two references: one to the previous node and one to the next node.

B One reference: to the next node only.

C No references; nodes are independent.

D Three references: to previous, next, and head nodes.

💡 Hint

Remember, singly linked lists connect nodes in one direction.

Each node in a singly linked list has exactly one reference, which points to the next node in the sequence.

🔍 Analysis

advanced

Identifying the end of a singly linked list

In a singly linked list, how can you identify the last node?

A The last node's next reference is null or None.

B The last node's next reference points to the head node.

C The last node has a reference to the previous node only.

D The last node contains no data.

💡 Hint

Think about what indicates the end of the list in a chain of nodes.

The last node in a singly linked list has its next reference set to null (or None), indicating no further nodes.

❓ Comparison

advanced

Difference between singly and doubly linked list nodes

Which statement correctly contrasts nodes in singly linked lists versus doubly linked lists?

A Singly linked list nodes have two references; doubly linked list nodes have one.

B Singly linked list nodes have no references; doubly linked list nodes have one.

C Both singly and doubly linked list nodes have the same number of references.

D Singly linked list nodes have one reference; doubly linked list nodes have two references.

💡 Hint

Consider how nodes connect in both directions in doubly linked lists.

Singly linked list nodes have one reference to the next node, while doubly linked list nodes have two references: one to the next node and one to the previous node.

❓ Reasoning

expert

Effect of missing next reference in a singly linked list node

What happens if a node in a singly linked list has its next reference accidentally set to null (None) before the actual end of the list?

A The list continues normally without any effect.

B The list automatically reconnects to the next node after the null reference.

C The list traversal stops prematurely, losing access to subsequent nodes.

D The node becomes the new head of the list.

💡 Hint

Think about how traversal depends on the next reference.

If a node's next reference is set to null before the list's actual end, traversal stops at that node, and all nodes after it become unreachable.