Find min, peak and range of an element in rotated sorted array

[paridhimalviya]

Problem 1: (https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/)
Problem 2: (https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/)
Problem 3: (https://leetcode.com/problems/find-peak-element/)

[super30admin]

• Strengths:

  • The code is well-commented and follows a logical structure.
  • The approach to solving the problem is correct in principle, using binary search to find the first and last occurrences of the target.
  • The separation of concerns into helper functions (binarySearchfirst and binarySearchLast) is a good practice.

• Areas for Improvement:

  • The binarySearchLast function is incomplete and contains a critical bug. It needs to include the else if and else conditions to handle cases where the target is not found or is less than/more than the middle element.
  • The initial check for nums.count == 0 is good, but the check for target < nums[0] || target > nums[nums.count - 1] could be moved to the beginning of the searchRange function to avoid unnecessary computations.
  • The variable names lowIndex and highIndex in searchRange are unused and should be removed.
  • The solution could benefit from more thorough testing, especially edge cases like empty arrays, single-element arrays, and arrays where the target is not present.

[super30admin]

Strengths:

• The code is well-commented and follows a logical structure.
• The binarySearchfirst function is correctly implemented and handles edge cases well.
• The approach to first find the first occurrence and then the last occurrence is sound.

Areas for Improvement:

• The binarySearchLast function needs to be completed to handle cases where the target is less than or greater than the mid element, similar to the binarySearchfirst function.
• Remove unused variables like lowIndex and highIndex to clean up the code.
• Ensure all edge cases are tested, such as when the target is not present in the array or when the array is empty.
• Consider adding more test cases to verify the correctness of the solution, especially for the binarySearchLast function.