Completed Hashing-1 2 problems

[raninagare]

No description provided.

[super30admin]

Group Anagrams (GroupAnagrams.java)

Strengths:

1. Your solution is correct and handles edge cases properly
2. The code is clean, well-organized, and easy to understand
3. Good use of comments to explain the time and space complexity
4. The approach using sorted strings as keys is a classic and reliable method

Areas for Improvement:

1. Time Complexity Optimization: You could achieve O(N * K) time complexity by using a character frequency count as the key instead of sorting. For example, you could create a string like "a2b1c0d0..." representing the count of each character. This avoids the O(K log K) sorting step.

2. Alternative Approach: Consider using prime number hashing (like the reference solution) for O(N * K) time complexity, though this approach has potential issues with floating-point precision.

3. Code Style: Consider adding a brief comment explaining the algorithm approach at the top of the method for better readability.

Overall, this is a solid solution that demonstrates good understanding of the problem and Java programming.

VERDICT: PASS

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Isomorphic Strings (IsomorphicStrings.java)

Strengths:

1. Your solution correctly implements the two HashMap approach to ensure a one-to-one character mapping.
2. Good comments explaining the time/space complexity and the main idea.
3. Clear variable naming and logical structure.
4. The defensive length check is a nice touch, even though it's guaranteed by the problem constraints.

Areas for Improvement:

1. Critical Syntax Error: Your code has class IsomorphicStrings. { which will not compile. The dot after the class name is invalid Java syntax. You should either use class Solution { (to match LeetCode's expected class name) or class IsomorphicStrings { (without the dot).
2. LeetCode Format: LeetCode expects the class to be named Solution, not IsomorphicStrings. While this might work in some IDEs, it won't pass on LeetCode's platform.
3. Consider removing the redundant length check since the problem guarantees equal lengths, or keep it as defensive programming - both are acceptable.
4. The comments could be slightly more concise, but overall they're helpful.

VERDICT: NEEDS_IMPROVEMENT

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Word Pattern

It appears that you have submitted solutions for the wrong problems. The assigned problem is "Word Pattern", which requires checking if a pattern string matches a string s such that there's a bijection between letters in the pattern and words in s.

Please:

1. Re-read the problem statement carefully
2. Submit a solution that specifically addresses the "Word Pattern" problem
3. Your approach should split the string s into words and then check the bijection between pattern characters and words

For reference, the approach should be similar to your "Isomorphic Strings" solution but adapted to work with words instead of characters. You would need to:

• Split s into an array of words
• Use two hash maps: one mapping pattern characters to words, and another mapping words to pattern characters
• Verify the bijection in both directions

VERDICT: NEEDS_IMPROVEMENT