Basic Indexing

Problem Statement

Access elements from a NumPy array using basic indexing.

Background

NumPy supports powerful indexing:

• arr[i] - single element
• arr[i, j] - element at row i, column j (for 2D)
• Negative indices count from end

Your Task

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

• "first": First element (as int)
• "last": Last element (as int)
• "middle": Middle element (use len//2 for index, as int)

Output Format

Return a dictionary with exactly these three keys.