Check if array contains contiguous integers with duplicates allowed

Code is given in the comment section.
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Code:




import java.util.*;
import java.lang.*;
import java.io.*;


class GFG {
public static void main (String[] args) {
Scanner obj=new Scanner(System.in);
int t=obj.nextInt();
for(int i=0;i<t;i++)
{
int l=obj.nextInt();
HashSet<Integer> a=new HashSet<Integer>();
ArrayList<Integer> b=new ArrayList<Integer>();
for(int j=0;j<l;j++)
{
int m=obj.nextInt();
if(a.contains(m))
{

}
else
{
a.add(m);
b.add(m);
}
}
Collections.sort(b);
int temp=1;
l=b.size();
for(int ikm=0;ikm<l-1;ikm++)
{

{
temp++;
}
}
if(temp==l)
{
System.out.println("Yes");
}
else
{
System.out.println("No");
}
a.clear();
b.clear();
}
}
}