Implement Binary Search -: 2d Array, Unknown Size, Rotated Array

[ayushcha2701]

No description provided.

[super30admin]

Search inside a Rotated Sorted Array (RotatedSortedArray.java)

Strengths:

1. Clean implementation with good variable naming
2. Correctly prevents integer overflow with left + (right-left)/2
3. Well-commented code explaining the algorithm approach
4. Proper handling of both sorted halves in the rotated array
5. Correctly returns -1 when target is not found

Areas for Improvement:

1. The condition in the else branch could be more explicit: if(nums[mid] < target && nums[right] >= target) would make the logic clearer and more consistent with the reference solution's style
2. Consider adding early return optimization (optional): checking if the array has only one element before entering the loop
3. The comment "On the basic of of the outcome" has a typo - should be "On the basis of the outcome"

Overall, this is a solid implementation that correctly solves the problem with optimal time and space complexity.

VERDICT: PASS

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Search Inside a Sorted Array whose Length is unknown (SearchInASortedArrayOfUnknownSize.java)

Strengths:

1. Correctly implements the exponential search to handle unknown array size
2. Good use of comments explaining the algorithm
3. Properly handles edge cases (checking index 0 first)
4. Correct mid-point calculation to avoid integer overflow

Areas for Improvement:

1. The binary search condition logic is unnecessarily complex. Since the array is guaranteed to be sorted in strictly increasing order, you can simplify the condition to just compare reader.get(mid) with target:
   • If reader.get(mid) > target, search left half
   • Otherwise, search right half
2. The condition reader.get(left) <= reader.get(mid) is always true for a strictly increasing sorted array, making the outer if-else branch redundant
3. Consider extracting the reader.get() result into a variable to avoid multiple calls to the same index (though this is a minor optimization)

The solution is functionally correct and efficient. The simplification of the binary search logic would improve readability without affecting correctness.

VERDICT: PASS

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Search a 2D Matrix (SearchA2DMatrix.java)

Strengths:

• Correctly implements binary search on a 2D matrix treated as 1D array
• Good use of comments explaining time/space complexity and approach
• Proper handling of edge cases (empty matrix would cause error, but constraints guarantee non-empty)
• Clean variable naming (left, right, mid, r, c)
• Avoids integer overflow by using left + (right - left) / 2 instead of (left + right) / 2

Areas for Improvement:

• Could add input validation for edge cases (though constraints guarantee non-empty matrices)
• The class name SearchA2DMatrix doesn't follow Java naming conventions (should be SearchA2DMatrix is actually fine, but typically would be SearchA2DMatrix or similar)
• Could consider making the method static if it's to be used without instantiation, or add a main method for testing

The solution is functionally equivalent to the reference solution and demonstrates good understanding of the binary search algorithm applied to a 2D matrix.

VERDICT: PASS