DSA · Theory

Implementation of Queue using Linked List

Theory

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Implementation of Queue using Linked List is simple if you keep it on paper. Meera uses it for a ticket queue node in a counter.

For Implementation of Queue using Linked List, Big-O is in play. Don’t blame it until you have traced a ticket queue node.

Implementation of Queue using Linked List exists so Meera can keep a ticket queue node correct in a counter.

Meera ships Implementation of Queue using Linked List in a counter. That is the use case worth saying.

If a ticket queue node breaks under Implementation of Queue using Linked List, check losing the next pointer on delete first.

Place Implementation of Queue using Linked List next to nearby DSA work — head → next → … is the link.

Viva for Implementation of Queue using Linked List: what it is → head → next → … → the mistake (losing the next pointer on delete).

Diagram

  front → [A][B][C] ← rear
  out ↑         ↑ in
       FIFO

Exam tip

Say Implementation of Queue using Linked List in one breath, then head → next → …, then losing the next pointer on delete.

from collections import deque

q = deque()
q.append(10)      # enqueue
q.append(20)
print(q.popleft())  # 10
print(list(q))

Implementation of Queue using Linked List — queue is FIFO. deque.popleft() is O(1).

DefImplementation of Queue using Linked List — Meera uses it for a ticket queue node in a counter.
RuleImplementation of Queue using Linked List → head → next → ….
RememberImplementation of Queue using Linked List + Big-O (a counter).
UseImplementation of Queue using Linked List in a counter (a ticket queue node).
TrapImplementation of Queue using Linked List — losing the next pointer on delete.
ExImplementation of Queue using Linked List → a ticket queue node.