Binary-search-2 Completed

[alokusw2]

No description provided.

[super30admin]

The student's solution demonstrates a good understanding of binary search algorithms and applies them effectively to solve the given problems. Here's a detailed evaluation:

1. Correctness:

   • Problem 1 (Find First and Last Position): The solution correctly implements binary search twice to find the first and last occurrences of the target. It handles the case when the target is not found appropriately.
   • Problem 2 (Find Minimum in Rotated Sorted Array): The solution correctly identifies the pivot point where the minimum element resides. It handles the rotation logic well.
   • Problem 3 (Find Peak Element): The solution correctly implements binary search to find a peak element, considering the given constraints.

2. Time Complexity:

   • All solutions maintain O(log n) time complexity, which meets the problem requirements.

3. Space Complexity:

   • All solutions use O(1) additional space, which is optimal.

4. Code Quality:

   • The code is well-structured and readable.
   • For Problem 1, the use of a helper function (findBound) is a good practice to avoid code duplication.
   • Variable names are clear and appropriate.
   • The solutions could benefit from brief comments explaining the logic, especially for Problem 2 and 3 where the binary search conditions might not be immediately obvious.

5. Efficiency:

   • The solutions are already efficient, but for Problem 2, the condition else: right -= 1 is unnecessary since the problem states there are no duplicates. This line could be removed.

Potential Edge Cases:

• For Problem 1, the solution handles empty arrays implicitly (since len(nums)-1 would be -1 and the loop won't execute), but it might be worth explicitly mentioning this case.
• For Problem 3, the solution works for arrays of length 1, but this edge case could be explicitly checked for clarity.