import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Arrays; import java.util.Comparator; public class Main { public static void main(String[] args) { int[][] a1 = new int[][] { { 1, 2, 0 }, { 2, 3, 0 }, { 3, 4, 0 }, {...