Completed S30 pre-course2

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Exercise 1 - Binary Search:

• Correctness: ✅ Correct implementation. Properly handles all cases: target less than, greater than, and equal to middle element.
• Time Complexity: ✅ O(logn) - correct
• Space Complexity: ✅ O(1) - correct
• Code Quality: Good, but could add type hints for better readability.

Exercise 2 - QuickSort (Recursive):

• Correctness: ✅ Correct recursive implementation. Partition logic properly places pivot in correct position.
• Time Complexity: ✅ O(nlogn) average case - correct
• Space Complexity: ⚠️ O(logn) is the call stack space for average case, but worst case is O(n). The comment is slightly misleading.
• Code Quality: Well-structured with clear separation between partition and quickSort functions.

Exercise 3 - Find Middle of Linked List:

• Correctness: ✅ Correct two-pointer (slow/fast) approach. Properly handles edge cases.
• Time Complexity: ✅ O(n) - correct
• Space Complexity: ✅ O(1) - correct
• Code Quality: Clean implementation. The commented-out print statements should be removed for cleaner code.

Exercise 4 - MergeSort:

• Correctness: ✅ Correct divide-and-conquer implementation. Properly handles merging of sorted subarrays.
• Time Complexity: ✅ O(nlogn) - correct
• Space Complexity: ⚠️ O(n) for the auxiliary arrays created during merge - correct
• Code Quality: Good structure, but the printList function has inconsistent indentation.

Exercise 5 - QuickSort (Iterative):

• Correctness: ✅ Correct iterative implementation using an explicit stack to simulate recursion.
• Time Complexity: ✅ O(nlogn) average case - correct
• Space Complexity: ⚠️ O(logn) average, O(n) worst case - the comment "O(n^2) worst case" for space is incorrect; it should be O(n) for worst case stack depth.
• Code Quality: Good implementation, but the comment about space complexity is technically wrong.

Overall Assessment:
The student demonstrates solid understanding of fundamental sorting algorithms and data structure operations. All implementations are functionally correct. Main areas for improvement:

1. Remove commented-out debug code
2. Fix space complexity comments (especially in Exercise 5)
3. Add consistent indentation
4. Consider adding type hints for better code documentation