/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
 
	public static int[] expand(int[][] src, int blockWidth, int blockHeight) {
 
	    if (src == null || src.length == 0) {
        	return new int[0];
    	}
 
        int span = src[0].length * blockWidth;
        int[] dest = new int[src.length * blockHeight * span];
        for (int i = 0; i < dest.length; i++) {
            dest[i] = src[(i / span) / blockHeight][(i % span) / blockWidth];
        }
        return dest;
    }
 
	public static void main (String[] args) throws java.lang.Exception
	{
		int[][] src = {
			{1,2},{3,4}	
		};
		int[] dest = expand(src, 4, 2);
		System.out.println(Arrays.toString(dest));
	}
}

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