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import java.util.Arrays;
public class Ch1 {
public static void main(String[] args) {
System.out.println(max_diff(new int[] { 5, 9, 3, 4, 6 }));
System.out.println(max_diff(new int[] { 1, -2, 3, -4 }));
System.out.println(max_diff(new int[] { -3, -1, -2, -4 }));
System.out.println(max_diff(new int[] { 10, 2, 0, 5, 1 }));
System.out.println(max_diff(new int[] { 7, 8, 9, 10, 10 }));
}
private static int max_diff(int[] arr) {
Arrays.sort(arr);
final int n = arr.length;
return arr[n - 1] * arr[n - 2] - arr[0] * arr[1];
}
}
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