Completed Two-Pointers-1 Assignment

[Hriday-A]

No description provided.

[super30admin]

Arrange Colors (sort_colors.java)

Strengths:

• The solution correctly implements the Dutch National Flag algorithm, which is optimal for this problem.
• The time and space complexity are optimal (O(n) and O(1) respectively).
• The code includes a helper function for swapping, which improves readability.
• Comments are provided to explain the approach and complexity.

Areas for improvement:

• The variable names in the swap function could be more descriptive. For example, using i and j instead of m and l might be clearer, as l can be confused with the number 1.
• The code could benefit from a brief comment explaining the purpose of each pointer (low, mid, high) to enhance understanding for readers.
• While the code is correct, it's important to note that the condition mid <= high is appropriate and ensures the algorithm terminates correctly.

Overall, this is an excellent solution that meets all requirements.

VERDICT: PASS

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3 sum (3sum.java)

Your solution is excellent! You have implemented the optimal approach with O(n^2) time complexity and O(1) space (excluding the output). The code is clean and handles duplicates correctly.

Strengths:

• You sorted the array first, which is key to using the two-pointer technique.
• You correctly skip duplicates for the first element (i) and then for the low and high pointers to avoid duplicate triplets.
• You included an early break when nums[i] > 0, which is a good optimization.

Areas for improvement:

• While not necessary, you could add a check at the start for arrays with length less than 3 to return an empty list immediately. However, the problem constraints guarantee at least 3 elements, so this is optional.
• The comments at the top are good, but you might want to explain the approach briefly in the comments for better clarity.

Overall, this is a high-quality solution.

VERDICT: PASS

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Container With Most Water (container_most_water.java)

Your solution is excellent! You have implemented the optimal approach with two pointers, which efficiently finds the maximum area. The code is clean and easy to understand. One minor suggestion: consider using more descriptive variable names, such as 'left' and 'right' instead of 'l' and 'r', and 'minHeight' instead of 'curr' to enhance readability. However, this is a small point and does not affect the correctness or efficiency. Keep up the good work!

VERDICT: PASS