Chapter 8, Problem 8.16PE

(Sort two-dimensional array) Write a method to sort a two-dimensional array using the following header:

public static void sort(int m[] [])

The method performs a primary sort on rows, and a secondary sort on columns. For example, the following array

{{4, 2} ,{1, 7} ,{4, 5},{1, 2} , {1, 1},{4, 1}}

will be sorted to

{{1, 1} , {1, 2} , {1, 7},{4, 1} , {4, 2} , {4, 5}}.