Done PreCourse-2 PR

[lalitha7571]

No description provided.

[super30admin]

The student's solution is incomplete as the binarySearch method does not contain any implementation. The problem requires implementing a binary search algorithm, which should efficiently find the index of a given element in a sorted array.

Strengths:

1. The code structure is clean and follows standard Java conventions.
2. The method signature is correctly defined with parameters for the array, left and right indices, and the target value.
3. The main method provides a good test case to verify the implementation once completed.

Areas for Improvement:

1. The binarySearch method needs to be implemented. The standard approach involves:
   • Checking if the right index is greater than or equal to the left index.
   • Calculating the middle index.
   • Comparing the middle element with the target value.
   • Recursively searching the left or right half based on the comparison.
2. Edge cases to consider:
   • The array is empty.
   • The target value is not present in the array.
   • The target value is the first or last element in the array.
3. The method should return -1 if the element is not found, which is correctly mentioned in the comments.

Time Complexity: Once implemented correctly, the binary search algorithm should have a time complexity of O(log n), where n is the number of elements in the array.

Space Complexity: The space complexity should be O(1) for an iterative implementation or O(log n) for a recursive implementation due to the call stack.

Code Quality: The code is well-structured and readable, but it needs the actual implementation to be functional.