[Solved] Which of the following problems CANNOT be solved using a binary tree preorder traversal? - Ans: Finding the shortest path between two nodes in an unweighted tree | Tree: Depth-First Search

Tree: Depth-First Search - Binary Tree Preorder Traversal

Which of the following problems CANNOT be solved using a binary tree preorder traversal?

AFinding the shortest path between two nodes in an unweighted tree

BSerializing a binary tree into a string preserving structure

CPrinting all nodes in root-left-right order

DCollecting node values in preorder for tree reconstruction

Step-by-Step Solution

Solution:

Step 1: Analyze each problem
Preorder traversal can print nodes in root-left-right order and serialize trees preserving structure.
Step 2: Identify the problem that doesn't fit
Finding shortest path requires BFS or DFS with path tracking, not preorder traversal alone.
Final Answer:
Option A -> Option A
Quick Check:
Preorder alone doesn't find shortest paths [OK]

Quick Trick: Shortest path needs BFS, not preorder [OK]

Common Mistakes:

MISTAKES

Trap Explanation:

PITFALL

Candidates confuse traversal with pathfinding algorithms and pick preorder for shortest path.

Interviewer Note:

CONTEXT

Tests candidate's ability to distinguish traversal use cases from other tree algorithms.

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Which of the following problems CANNOT be solved using a binary tree preorder traversal?