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DSA · Theory

Abstract Data Type (ADT)

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Theory

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Abstract Data Type (ADT)

Ananya only reaches for Abstract Data Type (ADT) when folder on disk has to stay correct in a file explorer.

Keep Abstract Data Type (ADT) small. Ananya should finish folder on disk in a few lines, not a 40-line dump.

Without Abstract Data Type (ADT), a file explorer gets messy and folder on disk is hard to trust.

Abstract Data Type (ADT) shows up in a file explorer. Name folder on disk, not “a real-world scenario”.

If folder on disk breaks under Abstract Data Type (ADT), check unbalanced BST becoming a list first.

Place Abstract Data Type (ADT) next to nearby DSA work — left < root < right is the link.

Close Abstract Data Type (ADT) with: “If I skip it, folder on disk goes wrong like this: unbalanced BST becoming a list.”

Diagram
      8
     / \
    3   10
   / \
  1   6
Exam tip

Board: folder on disk. Dry-run Abstract Data Type (ADT). Name the trap: unbalanced BST becoming a list.

Example

# Abstract Data Type (ADT)
data = [4, 1, 3]
print("start", data)
if data[0] > data[1]:
    data[0], data[1] = data[1], data[0]
print("after one step", data)

Abstract Data Type (ADT): dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefAbstract Data Type (ADT) — Ananya uses it for folder on disk in a file explorer.
  • RuleAbstract Data Type (ADT) → left < root < right.
  • RememberAbstract Data Type (ADT) + a dry-run table (a file explorer).
  • UseAbstract Data Type (ADT) in a file explorer (folder on disk).
  • TrapAbstract Data Type (ADT) — unbalanced BST becoming a list.
  • ExAbstract Data Type (ADT) → folder on disk.

Questions

1

What is Abstract Data Type (ADT)? Teach it with folder on disk.

2

When would Ananya actually reach for Abstract Data Type (ADT)?

3

How do you catch unbalanced BST becoming a list?

4

Write the smallest Abstract Data Type (ADT) step on folder on disk. What happens?

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