Chocolate Monger- April CookOff

1 
Scanner sc = new Scanner(System.in);
    	int t = sc.nextInt();
	
	while(t>0){
	    int n = sc.nextInt();
	    int x = sc.nextInt();
	    
	    ArrayList<Long> al = new ArrayList<>();
	
	    for(int i=0;i<n;i++){
	        al.add(sc.nextLong());
	       
	    }
	    
	    Collections.sort(al);
	    int count=0;
	    for(int i=1;i<al.size();){
	        if(al.get(i)==al.get(i-1)){
	            count++;
	            al.remove(i);
	        }else i++;
	    }
	    
	    if(count>=x) System.out.println(al.size());
	    else {
	        x=x-count;
	       if(x>=al.size()) System.out.println(0);
	       else{
	           System.out.println(al.size()-x);
	       }
	       
	    }
	    
	    t--;
	}
2

Please Can anyone tell me the error in above code it seems to be giving right answers