class Ideone
{
	/*public static int f(int v[],int d){
		int m=0,i=0,j,t,l=v.length;
		for(;i<l;i++)
			for(j=i;j<l;j++){
				m = j-i<d && (t=Math.abs(v[i]-v[j]))>m ? t : m;
			}
		return m;
	}*/
	public static 
	int f(int v[],int d){int m=0,i=0,j,t,l=v.length;for(;i<l;i++)for(j=i;j<l;j++)m=j-i<d&&(t=Math.abs(v[i]-v[j]))>m?t:m;return m;}

	public static void main (String[] args) throws java.lang.Exception
	{
		int[] numbers={6,9,4,7,4,1};
		System.out.println(f(numbers,3));
		int[] numbers2={0,10,1,100,2,1000};
		System.out.println(f(numbers2,3));
		System.out.println(f(numbers2,4));
	}
}