Solved Binary Tree Level Order Traversal and Course Schedule

[anirudhv98]

Completed BFS-1, please review.

[super30admin]

Level Order Traversal in Binary tree (Problem1.cs)

Strengths:

• Clean and readable implementation that matches the standard BFS approach for level order traversal
• Good use of early return pattern for null root
• Proper handling of left and right children
• Well-documented with time/space complexity comments
• Correctly uses IList<IList> as the return type, which is appropriate for LeetCode

Areas for Improvement:

• The solution is functionally equivalent to the reference and doesn't have significant issues
• Minor suggestion: Could consider using var for local variables like tempList for brevity, though this is stylistic

VERDICT: PASS

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Scheduling Courses (Problem2.cs)

Strengths:

• Correctly implements topological sort using Kahn's algorithm
• Good variable naming (adjMap, inwardCount, q)
• Proper handling of edge cases
• Clean and readable code structure
• Appropriate use of C# collections

Areas for Improvement:

• The adjacency list direction could be more intuitive. Currently storing adjMap[course] = list of prerequisites, but the standard approach typically stores adjMap[prereq] = list of courses that depend on it. This works but may be slightly confusing to maintain.
• Could add null checks or use TryGetValue to avoid repeated ContainsKey checks
• The initial count increment (count += 1) for zero in-degree courses could be moved inside the while loop for better consistency

Overall, this is a solid solution that correctly solves the problem with good complexity characteristics.

VERDICT: PASS