DSA · Theory

Queue Operations in DS

Theory

201/810

Queue Operations in DS

Queue Operations in DS is a DSA topic. In plain words you use it for print jobs in a lab printer. Don’t start with a slogan — start with that picture.

Smallest example: enqueue / dequeue FIFO. Type it, run it, and say what you see. If you can do that from memory, you know Queue Operations in DS.

From the example next to this theory — Queue Operations in DS — queue is FIFO.

Trap — confusing front and rear. Fix that before you talk about advanced DSA.

Viva — what is Queue Operations in DS? Then show enqueue / dequeue FIFO. Then name the trap.

Diagram

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

Exam tip

What is Queue Operations in DS? Show this: enqueue / dequeue FIFO. Trap: confusing front and rear.

Example

from collections import deque

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

Queue Operations in DS — queue is FIFO. deque.popleft() is O(1).

Short notes

DefQueue Operations in DS — print jobs in a lab printer.
Ruleenqueue / dequeue FIFO
Trapconfusing front and rear
Usea lab printer

DSA · Theory

Queue Operations in DS

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Theory

201/810

Queue Operations in DS

Queue Operations in DS is a DSA topic. In plain words you use it for print jobs in a lab printer. Don’t start with a slogan — start with that picture.

Smallest example: enqueue / dequeue FIFO. Type it, run it, and say what you see. If you can do that from memory, you know Queue Operations in DS.

From the example next to this theory — Queue Operations in DS — queue is FIFO.

Trap — confusing front and rear. Fix that before you talk about advanced DSA.

Viva — what is Queue Operations in DS? Then show enqueue / dequeue FIFO. Then name the trap.

Diagram

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

Exam tip

What is Queue Operations in DS? Show this: enqueue / dequeue FIFO. Trap: confusing front and rear.

Example

from collections import deque

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

Queue Operations in DS — queue is FIFO. deque.popleft() is O(1).

Short notes

DefQueue Operations in DS — print jobs in a lab printer.
Ruleenqueue / dequeue FIFO
Trapconfusing front and rear
Usea lab printer

Queue Operations in DS

Example

Short notes

Questions

Queue Operations in DS

Example

Short notes

Questions