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

Tree: Depth-First Search - Binary Tree Postorder Traversal

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

ADeleting all nodes in a binary tree safely from leaves up to root

BFinding the shortest path between two nodes in a binary tree

CEvaluating an expression tree where operators are internal nodes and operands are leaves

DSerializing a binary tree in a way that children are recorded before parents

Step-by-Step Solution

Solution:

Step 1: Analyze each problem
Expression evaluation and safe deletion require postorder traversal; shortest path is a graph problem, not solved by postorder.
Step 2: Identify which cannot be solved by postorder
Shortest path requires BFS or DFS with path tracking, not postorder traversal.
Final Answer:
Option B -> Option B
Quick Check:
Shortest path needs different traversal [OK]

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

Common Mistakes:

MISTAKES

Trap Explanation:

PITFALL

Candidates often think any tree problem can be solved by traversal, missing that shortest path requires BFS or DFS with path tracking.

Interviewer Note:

CONTEXT

Tests candidate's ability to distinguish traversal applicability vs graph pathfinding

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