Completed Two-Pointers-2

[ManasviReddy25]

No description provided.

[super30admin]

Merging of 2 arrays (Problem1.py)

1. Wrong Problem: You submitted a solution for "Remove Duplicates from Sorted Array II" instead of "Merge Sorted Array". Please ensure you're solving the correct problem assigned.

2. Code Issues: Even for the problem you attempted, there are bugs:

   • Using fast in condition check before incrementing causes redundant comparisons
   • The loop variable i is unused while fast is manually managed, which is confusing

3. Missing Solution: You haven't provided any solution for the actual merge problem. The correct approach would use three pointers starting from the end of the arrays.

4. Readability: While the comments are present, the variable naming could be clearer (e.g., count is actually tracking consecutive occurrences).

VERDICT: NEEDS_IMPROVEMENT

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Search 2D sorted matrix II (Problem2.py)

Strengths:

• The code for the merge problem is well-structured and follows good practices
• Clear variable naming (p1, p2, p3) with comments explaining their purposes
• Correct in-place merging logic using three pointers
• Handles edge cases properly (copying remaining nums2 elements)

Areas for Improvement:

• This submission is for the wrong problem entirely
• The student should ensure they are solving the problem that was actually assigned
• For the merge problem specifically, the solution is already optimal

The submitted code solves a completely different problem than what was requested. To solve "Search 2D sorted matrix II," the student would need to implement a search algorithm that leverages the sorted row and column properties, such as starting from the top-right corner and moving left/down based on comparisons, or performing binary search on each row.

VERDICT: NEEDS_IMPROVEMENT

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Edit and Remove Duplicates in an array (Problem3.py)

1. Wrong Problem: You have submitted a solution for "Search a 2D Matrix II" instead of "Edit and Remove Duplicates in an array" (which appears to be a variant of LeetCode Completed Two Pointers2 - Please review #80 - Remove Duplicates from Sorted Array II). These are completely different problems.

2. Missing Implementation: There is no code to remove duplicates or limit elements to at most 2 occurrences. The student's solution searches for a target value in a 2D matrix.

3. What you should do: You need to implement a two-pointer solution where:

   • A slow pointer tracks where to place the next valid element
   • A fast pointer scans through the array
   • Count consecutive occurrences and only copy elements when count ≤ 2
   • Return the count of valid elements (slow pointer position)

4. Reference approach hint: The correct solution uses a while loop with fast pointer, maintains a count of consecutive duplicates, and only copies elements to slow position when count is ≤ 2.

VERDICT: NEEDS_IMPROVEMENT