Added solutions

[LeelaTotapally]

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[super30admin]

Search inside a Rotated Sorted Array (Problem1.java)

Strengths:

• The solution is well-structured with clear comments
• Uses binary search correctly on a flattened 2D matrix
• Properly handles edge cases (returns false when not found)
• Good variable naming and code organization

Areas for Improvement:

1. Wrong Problem: The solution addresses a completely different problem (2D matrix search) rather than the rotated sorted array search problem that was assigned.
2. Operator Precedence Bug: The line int mid = low + (high-low/2) has incorrect parentheses. Due to operator precedence, this evaluates as low + (high - (low/2)) instead of (low + high) / 2. Should be int mid = low + (high - low) / 2.
3. Misleading Comments: The comments reference a 2D matrix problem, which is not relevant to the rotated sorted array problem.
4. Time Complexity: For the problem it solves (2D matrix), the O(log(m*n)) complexity is correct, but for the intended problem, this approach wouldn't work at all.

Recommendation: Please ensure you read the problem statement carefully and implement the correct algorithm. For the rotated sorted array problem, you need to use a modified binary search that determines which half of the array is sorted and then decide which half to search based on where the target lies.

VERDICT: NEEDS_IMPROVEMENT

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Search Inside a Sorted Array whose Length is unknown (Problem2.java)

Strengths:

• Clean, well-indented code with good variable naming
• Clear comments explaining the approach
• Correct implementation of binary search for rotated arrays
• Proper use of low + (high - low)/2 to prevent integer overflow

Areas for Improvement:

• The solution addresses a completely different problem (rotated sorted array search) rather than the unknown-length sorted array search
• The code doesn't use the ArrayReader interface as required
• For the unknown-length array problem, the solution should:
  1. First use exponential search (doubling high until reader.get(high) > target) to find bounds
  2. Then perform binary search within those bounds
• The comment incorrectly states "We are using binary search to find the target in the rotated sorted array" - this is not the problem being asked

VERDICT: NEEDS_IMPROVEMENT

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Search a 2D Matrix

Strengths:

1. Excellent documentation with time/space complexity comments
2. Clear explanation of approach in comments
3. Problem 2 shows solid understanding of binary search variations
4. Clean code structure with proper variable naming

Areas for Improvement:

1. Critical Bug in Problem 1: The mid calculation low + (high-low/2) has incorrect operator precedence. It should be low + (high - low) / 2. Always use parentheses to ensure correct order of operations.
2. Problem 2: The comment at the end //5,6,7,0,1,2,3 appears to be leftover debug code or an incomplete comment - should be removed for cleaner code.
3. Consider adding early return optimization (optional): In Problem 1, you could check if target is out of bounds of the matrix's range at the start to potentially save iterations.

VERDICT: NEEDS_IMPROVEMENT