Completed BFS-1

[sandeepkumarks]

No description provided.

[super30admin]

Binary Tree Level Order Traversal (BTLevelOrderTraversal.java)

Strengths:

• Clean, readable implementation that matches the reference solution's approach
• Proper use of Java's Queue interface with LinkedList implementation
• Good variable naming and code organization
• Includes time and space complexity comments as expected in technical interviews
• Handles edge cases properly (null root)

Areas for Improvement:

• The solution is complete and well-implemented. No significant improvements needed.
• Minor suggestion: Could add comments for the TreeNode class definition if this were a complete file, but for LeetCode submission this is fine.

VERDICT: PASS

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Course Schedule (CourseSchedule.java)

Strengths:

• Correctly implements the topological sort algorithm using BFS/Kahn's algorithm
• Clear explanation in comments explaining the approach
• Good variable naming and code structure
• Properly handles edge cases (no dependent courses)
• Time and Space complexity comments are accurate

Areas for Improvement:

• The map lookup in the loop preRequisiteMap.get(prerequisites[i][1]) could be simplified using Map.getOrDefault() method
• The code could be more concise by using computeIfAbsent() for building the adjacency list
• The finishedCourses counter could be incremented more efficiently

Example improvement:

// Instead of:
List<Integer> current = null;
if(preRequisiteMap.containsKey(prerequisites[i][1])) {
    current = preRequisiteMap.get(prerequisites[i][1]);
} else {
    current = new ArrayList<>();
}
current.add(prerequisites[i][0]);
preRequisiteMap.put(prerequisites[i][1], current);

// Use:
preRequisiteMap.computeIfAbsent(prerequisites[i][1], k -> new ArrayList<>())
    .add(prerequisites[i][0]);

VERDICT: PASS