Strengths:

• The student has demonstrated a good understanding of both problems and provided efficient solutions.
• The code is clean, well-commented, and follows best practices.
• The use of Kotlin's features enhances readability and conciseness.

Areas for Improvement:

• For the twoSum solution, the return statement return intArrayOf(0,0) could be improved to return intArrayOf(-1,-1) to indicate no solution was found, similar to the reference solution.
• The knapsack solution could benefit from a brief comment explaining the base case (when i == 0 || j == 0) for clarity.