The program takes a 12-digit number as input and splits it into pairs of 2, 3, 4 and 6 digits. It stores each pair in ArrayLists and checks if the numbers in each ArrayList are in increasing order, printing the ArrayLists if in order or an error message if not. It defines a count method to get the digit length of the input number.

1. import java.util.ArrayList;
import java.util.Scanner;
public class Pairs {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc=new Scanner(System.in);
System.out.println("Enter 12 digit number:");
long num=sc.nextLong();
if(count(num)!=12){
System.out.println("Invalid input");
}
else{
ArrayList al=new ArrayList();
String s=""+num;
int i=0;
while(i!=12){
al.add(Long.parseLong(s.substring(i, i+2)));
i=i+2;
}
ArrayList al1=new ArrayList();
String s1=""+num;
int i1=0;
while(i1!=12){
al1.add(Long.parseLong(s1.substring(i1, i1+3)));
i1=i1+3;
}
ArrayList al2=new ArrayList();
String s2=""+num;
int i2=0;
while(i2!=12){
al2.add(Long.parseLong(s2.substring(i2, i2+4)));
i2=i2+4;
}
ArrayList al3=new ArrayList();
String s3=""+num;

2. int i3=0;
while(i3!=12){
al3.add(Long.parseLong(s3.substring(i3, i3+6)));
i3=i3+6;
}
boolean flag=true;
loop: for(long j:al){
for(long k:al){
if(j>k){
flag=false;
break loop;
}
}
}
if(flag){
System.out.println(al);
}
else{
System.out.println("6 2digit numbers are not in increasing order");
}
boolean flag1=true;
loop1: for(long j:al1){
for(long k:al1){
if(j>k){
flag1=false;
break loop1;
}
}
}
if(flag1){
System.out.println(al1);
}
else{
System.out.println("4 3digit numbers are not in increasing order");
}

3. boolean flag2=true;
loop2: for(long j:al2){
for(long k:al2){
if(j>k){
flag2=false;
break loop2;
}
}
}
if(flag2){
System.out.println(al2);
}
else{
System.out.println("3 4digit numbers are not in increasing order");
}
boolean flag3=true;
loop3: for(long j:al3){
for(long k:al3){
if(j>k){
flag3=false;
break loop3;
}
}
}
if(flag3){
System.out.println(al3);
}
else{
System.out.println("2 6digit numbers are not in increasing order");
}
}
}
public static long count(long num){

4. long count=0;
while(num!=0){
num=num/10;
count++;
}
return count;
}
}
Solution
import java.util.ArrayList;
import java.util.Scanner;
public class Pairs {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc=new Scanner(System.in);
System.out.println("Enter 12 digit number:");
long num=sc.nextLong();
if(count(num)!=12){
System.out.println("Invalid input");
}
else{
ArrayList al=new ArrayList();
String s=""+num;
int i=0;
while(i!=12){
al.add(Long.parseLong(s.substring(i, i+2)));
i=i+2;
}
ArrayList al1=new ArrayList();
String s1=""+num;
int i1=0;
while(i1!=12){
al1.add(Long.parseLong(s1.substring(i1, i1+3)));

5. i1=i1+3;
}
ArrayList al2=new ArrayList();
String s2=""+num;
int i2=0;
while(i2!=12){
al2.add(Long.parseLong(s2.substring(i2, i2+4)));
i2=i2+4;
}
ArrayList al3=new ArrayList();
String s3=""+num;
int i3=0;
while(i3!=12){
al3.add(Long.parseLong(s3.substring(i3, i3+6)));
i3=i3+6;
}
boolean flag=true;
loop: for(long j:al){
for(long k:al){
if(j>k){
flag=false;
break loop;
}
}
}
if(flag){
System.out.println(al);
}
else{
System.out.println("6 2digit numbers are not in increasing order");
}
boolean flag1=true;
loop1: for(long j:al1){
for(long k:al1){
if(j>k){

6. flag1=false;
break loop1;
}
}
}
if(flag1){
System.out.println(al1);
}
else{
System.out.println("4 3digit numbers are not in increasing order");
}
boolean flag2=true;
loop2: for(long j:al2){
for(long k:al2){
if(j>k){
flag2=false;
break loop2;
}
}
}
if(flag2){
System.out.println(al2);
}
else{
System.out.println("3 4digit numbers are not in increasing order");
}
boolean flag3=true;
loop3: for(long j:al3){
for(long k:al3){
if(j>k){
flag3=false;
break loop3;
}
}

7. }
if(flag3){
System.out.println(al3);
}
else{
System.out.println("2 6digit numbers are not in increasing order");
}
}
}
public static long count(long num){
long count=0;
while(num!=0){
num=num/10;
count++;
}
return count;
}
}