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DSA · Theory

Diameter of an N-ary Tree

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Theory

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Diameter of an N-ary Tree

Don’t start Diameter of an N-ary Tree with jargon. Start with folder on disk. That is the whole point.

Diameter of an N-ary Tree order — meaning → left < root < right → one limit. Dumping ten features helps nobody.

Without Diameter of an N-ary Tree, a file explorer gets messy and folder on disk is hard to trust.

Use Diameter of an N-ary Tree when folder on disk must stay clear. If a simpler DSA step works, use that instead.

Diameter of an N-ary Tree trap — unbalanced BST becoming a list. Neha loses marks for that every viva.

Place Diameter of an N-ary Tree next to nearby DSA work — left < root < right is the link.

Close Diameter of an N-ary Tree with: “If I skip it, folder on disk goes wrong like this: unbalanced BST becoming a list.”

Exam tip

Say Diameter of an N-ary Tree in one breath, then left < root < right, then unbalanced BST becoming a list.

Example

# Diameter of an N-ary Tree
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)

Diameter of an N-ary Tree: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefDiameter of an N-ary Tree — Neha uses it for folder on disk in a file explorer.
  • RuleDiameter of an N-ary Tree → left < root < right.
  • RememberDiameter of an N-ary Tree + a dry-run table (a file explorer).
  • UseDiameter of an N-ary Tree in a file explorer (folder on disk).
  • TrapDiameter of an N-ary Tree — unbalanced BST becoming a list.
  • ExDiameter of an N-ary Tree → folder on disk.

Questions

1

In one breath: what does Diameter of an N-ary Tree do for Neha?

2

When would Neha actually reach for Diameter of an N-ary Tree?

3

Which mistake makes folder on disk fail?

4

Change one input on folder on disk. Predict the new result.

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