SpiralMatrix

import java.util.Scanner;

public class SpiralMatrix {
    public static void main(String args[])
    {
        Scanner scanner = new Scanner(System.in);

        int n = scanner.nextInt();

        int[][] matrix = new int[n][n];

        int value = 1;
        int minCol = 0;
        int maxCol = n-1;
        int minRow = 0;
        int maxRow = n-1;

        while (value <= n*n)
        {
            for (int i = minCol; i <= maxCol; i++)
            {
                matrix[minRow][i] = value;

                value++;
            }

            for (int i = minRow+1; i <= maxRow; i++)
            {
                matrix[i][maxCol] = value;

                value++;
            }

            for (int i = maxCol-1; i >= minCol; i--)
            {
                matrix[maxRow][i] = value;

                value++;
            }

            for (int i = maxRow-1; i >= minRow+1; i--)
            {
                matrix[i][minCol] = value;

                value++;
            }

            minCol++;

            minRow++;

            maxCol--;

            maxRow--;
        }

        for (int i = 0; i < matrix.length; i++)
        {
            for (int j = 0; j < matrix.length; j++)
            {
                System.out.printf("%d ", matrix[i][j]);
            }

            System.out.println();
        }
    }
}