Completed Hashing-2

[ManasviReddy25]

No description provided.

[super30admin]

Subarray Sum Equals K (Problem1.py)

Strengths:

• The solution demonstrates a solid understanding of the prefix sum + hashmap technique
• Clear and readable code structure with meaningful variable names
• Good inline comments explaining the logic
• Correctly handles edge cases (pre-loading {0: 1})

Areas for Improvement:

• Avoid using map as a variable name since it shadows Python's built-in function. Consider renaming to prefix_count or freq_map
• The comment "pre-load 0:1 as dummy" could be more descriptive - explain why this is necessary (to count subarrays starting from index 0)
• Consider adding a brief docstring at the class/method level for better documentation

Minor Optimization:

• The solution is already optimal for this problem. The current approach is the standard O(n) solution for this problem.

VERDICT: PASS

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Contiguous Binary Subarray (Problem2.py)

Strengths:

• Correct algorithm implementation that handles all edge cases
• Good use of comments to explain the approach
• Clear variable naming that makes the code readable
• Proper handling of the initial case with {0: -1} in the map
• Efficient O(n) time complexity

Areas for Improvement:

• The import from rpds import List is non-standard. Use from typing import List or simply remove the type hint since Python can infer the type
• Consider using map.get(rsum) with a default value for a slightly more Pythonic approach, though the current implementation is correct
• The variable name map shadows the built-in function, which is a minor issue - consider renaming to sum_index_map or similar

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

VERDICT: PASS

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Longest Palindrome in a string (Problem3.py)

Strengths:

• Clean, readable code with good variable naming
• Clear comments explaining the approach
• Correct algorithm implementation
• Proper handling of the odd-length palindrome case (adding 1 for center character)

Areas for Improvement:

• The space complexity comment "O(1):Set holds max 52 chars,so it is fixed" is technically correct but could be more precisely stated as O(1) or O(min(n, 52)) since the set size is bounded by the alphabet
• Minor: Could use if i in charset more idiomatically with if i not in charset to avoid the else clause being the "add" case, but this is a style preference

Overall, this is a solid solution that matches the reference implementation in both approach and efficiency.

VERDICT: PASS