Rotate Matrix

Problem Overview

• Rotate an N×M matrix by 90 degrees and output the transformed matrix.
• Input: two integers N and M, followed by matrix entries; constraint: N = M (square matrix).
• Output: the matrix after a 90-degree rotation, printed in standard row order.
• Real-world domain: matrix manipulation and image/data processing tasks.
• From Cisco interviews; a common coding interview problem and interview question.