Create coding3.java

[Praniksha123]

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[super30admin]

Pascal's Triangle (coding3.java)

Strengths:

• The code is well-structured with clear variable names
• Uses appropriate Java collections (HashMap)
• Has good comments explaining the approach
• Handles edge cases (k == 0) separately

Areas for Improvement:

• Wrong Problem: This solution solves a different problem entirely. Always ensure you're solving the problem that was asked.
• Missing Pascal's Triangle Logic: The solution needs nested loops to build each row, where each element is the sum of two adjacent elements from the previous row.
• No row construction: Pascal's triangle requires building vectors/arrays for each row, not just counting frequencies.

Note: If this were the K-diff Pairs problem, the solution would be correct. For Pascal's Triangle, you need to completely rethink the approach.

VERDICT: NEEDS_IMPROVEMENT

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K-diff Pairs in an Array

Strengths:

• Excellent approach using frequency counting that naturally handles uniqueness
• Clean, readable code with good comments
• Correctly handles the k=0 edge case
• More memory-efficient than the reference solution (no need for a set of vectors)
• Proper use of HashMap methods (getOrDefault, containsKey)

Areas for Improvement:

• The solution could add a check for negative k (though constraints say k >= 0)
• Could consider using Integer wrapper type explicitly when iterating over map.keySet() for absolute clarity
• The comment block could be more detailed about why the k=0 case is handled differently

Minor Note:
The reference solution has O(n²) complexity in the worst case due to the nested loop checking complements for each element, while the student's solution maintains true O(n) complexity. The student's approach is actually more efficient.

VERDICT: PASS