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DSA · Theory

Huffman Tree

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Theory

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Huffman Tree

Huffman Tree is simple if you keep it on paper. Ananya uses it for folder on disk in a file explorer.

Huffman Tree on the board — left < root < right. Then say what folder on disk looks like after.

Huffman Tree exists so Ananya can keep folder on disk correct in a file explorer.

Use Huffman Tree when folder on disk must stay clear. If a simpler DSA step works, use that instead.

Huffman Tree miss — unbalanced BST becoming a list. Fix it before you talk about advanced DSA.

Place Huffman Tree next to nearby DSA work — left < root < right is the link.

Viva for Huffman Tree — what it is → left < root < right → the mistake (unbalanced BST becoming a list).

Exam tip

For Huffman Tree: definition + a file explorer + one failure.

Example

# Huffman 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)

Huffman Tree: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefHuffman Tree — Ananya uses it for folder on disk in a file explorer.
  • RuleHuffman Tree → left < root < right.
  • RememberHuffman Tree + a dry-run table (a file explorer).
  • UseHuffman Tree in a file explorer (folder on disk).
  • TrapHuffman Tree — unbalanced BST becoming a list.
  • ExHuffman Tree → folder on disk.

Questions

1

What is Huffman Tree? Teach it with folder on disk.

2

When would Ananya actually reach for Huffman 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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