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import java.util.*;
import java.io.*;

class GFG 
{ 
	static int R = 4, C = 4;

	static void bTraversal(int mat[][])
	{
		if(R == 1)
		{
			for(int i = 0; i < C; i++)
				System.out.print(mat[0][i] + " ");
		}
		else if(C == 1)
		{
			for(int i = 0; i < R; i++)
				System.out.print(mat[i][0] + " ");
		}
		else
		{
			for(int i = 0; i < C; i++)
				System.out.print(mat[0][i] + " ");
			for(int i = 1; i < R; i++)
				System.out.print(mat[i][C - 1] + " ");
			for(int i = C - 2; i >= 0; i--)
				System.out.print(mat[R - 1][i] + " ");
			for(int i = R - 2; i >= 1; i--)
				System.out.print(mat[i][0] + " ");
		}
	}

	public static void main(String args[]) 
    {
        int arr[][] = {{1, 2, 3, 4},
    				   {5, 6, 7, 8},
    				   {9, 10, 11, 12},
    				   {13, 14, 15, 16}};

    	bTraversal(arr);
    } 
}

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