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    Question

    A recursive backtracking solution for the Subset Sum

    problem is generating duplicate subsets or missing valid subsets. Assuming the input array might contain duplicates, what is a crucial step often overlooked or incorrectly implemented to handle this?
    A Not sorting the input array initially. Correct Answer Incorrect Answer
    B Incorrectly updating the current_sum in recursive calls. Correct Answer Incorrect Answer
    C Failing to pop elements from the current_subset during backtracking. Correct Answer Incorrect Answer
    D Not skipping duplicate elements in the iteration loop to avoid redundant paths. Correct Answer Incorrect Answer
    E The base case for current_sum == target is missing. Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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