DSA · Theory

Implementation of Queue using Array

Theory

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Don’t start Implementation of Queue using Array with jargon. Start with print jobs. That is the whole point.

Keep Implementation of Queue using Array small. Vikram should finish print jobs in a few lines, not a 40-line dump.

Skip Implementation of Queue using Array and confusing front and rear shows up in a lab printer.

Use Implementation of Queue using Array when print jobs must stay clear. If a simpler DSA step works, use that instead.

Implementation of Queue using Array miss: confusing front and rear. Fix it before you talk about advanced DSA.

After Implementation of Queue using Array, Vikram should still remember confusing front and rear.

One breath for Implementation of Queue using Array, then print jobs, then confusing front and rear. Sit down.

Diagram

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

Exam tip

Say Implementation of Queue using Array in one breath, then enqueue / dequeue FIFO, then confusing front and rear.

from collections import deque

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

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

DefImplementation of Queue using Array — Vikram uses it for print jobs in a lab printer.
RuleImplementation of Queue using Array → enqueue / dequeue FIFO.
RememberImplementation of Queue using Array + a dry-run table (a lab printer).
UseImplementation of Queue using Array in a lab printer (print jobs).
TrapImplementation of Queue using Array — confusing front and rear.
ExImplementation of Queue using Array → print jobs.