Unique and Count

Problem Statement

Find unique elements and their counts in a NumPy array.

Background

• np.unique(arr): Returns sorted unique elements
• np.unique(arr, return_counts=True): Also returns count of each element

Your Task

Write a function unique_count(arr) that returns a dictionary with:

• "unique": Unique elements (sorted) as list
• "counts": Count of each unique element as list
• "num_unique": Number of unique elements

Output Format

Return a dictionary with exactly these three keys.