hashing2

[YogeshPardeshi]

No description provided.

[super30admin]

Subarray Sum Equals K (Problem1.java)

Strengths:

• Correct implementation of the prefix sum + hashmap technique
• Clean, readable code with good variable naming
• Proper handling of edge cases (initializing map with {0:1})
• Efficient use of getOrDefault method

Areas for Improvement:

• Class name should be more descriptive (e.g., "Solution" or "SubarraySumCalculator")
• Could add a brief comment explaining the core algorithm insight
• Consider adding input validation for robustness (though not strictly necessary for this problem)

The solution is functionally equivalent to the reference and demonstrates solid understanding of the problem-solving approach.

VERDICT: PASS

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Contiguous Binary Subarray (Problem2.java)

Strengths:

• Excellent implementation that matches the reference solution exactly
• Clean and readable code structure
• Correct understanding of the running sum technique
• Proper handling of edge cases (initializing map with 0 -> -1)

Minor Suggestions:

• Consider using Map<Integer, Integer> instead of HashMap<Integer, Integer> for better programming practice (programming to interfaces)
• Could add a brief comment explaining the transformation of 0→-1 and 1→+1 for future maintainability

VERDICT: PASS

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Longest Palindrome in a string (Problem3.java)

Strengths:

• Good use of a fixed-size boolean array instead of a dynamic data structure
• Clean iteration using enhanced for-loop
• Correctly handles the core logic of counting pairs

Areas for Improvement:

• The edge case logic if(s.length() == count) return count; is incorrect. This checks if all characters formed pairs, but the correct check should be whether any unpaired character exists. For "ab", this returns 2 instead of 1.
• The variable name set is misleading for a boolean array - consider renaming to seen or hasPair
• Add comments explaining the logic, especially for the palindrome construction rules
• Consider using a more descriptive condition like checking if any element in the array is true

VERDICT: NEEDS_IMPROVEMENT