s30 completed Binary-Search-1

[prenastro]

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[super30admin]

Search in Rotated Sorted Array (rotated_sorted_array_search.py)

This is a solid implementation of the rotated sorted array search problem. The binary search logic is correctly implemented, and the code is clean and readable. A minor improvement could be using mid = left + (right - left) // 2 instead of (left + right) // 2 to prevent potential integer overflow, though this is more of a concern in languages like C++/Java. In Python, integers have arbitrary precision, so this isn't an issue. The solution demonstrates a good understanding of the algorithm.

VERDICT: PASS

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Search in a Sorted Array of Unknown Size (search_sorted_array_uknown_size.py)

Strengths:

• Clean, readable implementation that closely matches the reference solution
• Correctly implements the exponential search + binary search pattern
• Good variable naming and code organization
• Handles edge cases properly (returns -1 when target not found)

Areas for Improvement:

• The solution is already well-optimized. One minor consideration: the current implementation assumes the array exists and will eventually find a range. In the extremely rare case where the target is smaller than the first element, the while loop condition reader.get(right) < target would immediately fail, and binary search would correctly return -1. This is handled correctly but could be documented with a comment for clarity.

Overall, this is a solid implementation that demonstrates good understanding of the problem and algorithm.

VERDICT: PASS

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Search a 2D Matrix (2dmatrix.py)

This is an excellent solution that mirrors the reference approach perfectly. The student demonstrates a solid understanding of binary search and the ability to apply it to a 2D matrix problem by treating it as a virtual 1D array. The code is clean, well-documented, and follows Python best practices. The index conversion logic (r = mid // cols, c = mid % cols) is correctly implemented. Great work!

VERDICT: PASS