Move All Negative Elements to end

Approach Explanation o(￣▽￣)o

1. I collected positives and negatives separately.
2. I concatenated them in the correct order.
3. I reassigned the result back to arr[:] so the original array is updated.
4. This way, positives stay at the front, negatives move to the end, and the order is preserved.

Methods Used: (*￣o￣)/

• List comprehension
• Stable partition method
• Single traversal
• Extra space