I don’t know why am I getting Wrong Answer on TEST 15???
Below down is my code…
import java.util.;
import java.lang.;
class Main
{
public static void main (String[] args) throws java.lang.Exception{
Scanner sc=new Scanner(System.in);
int j=0;
int tc=sc.nextInt();
for(int i=0;i<tc;i++){
ArrayList<String> al=new ArrayList<>();;
String c=null;
int n=sc.nextInt();
int k=sc.nextInt();
String p=sc.next();
while(j+k<=p.length()){
c= p.substring(j,j+k);
if(!al.contains(c))
al.add(c);
j++;
}
System.out.println(al.size());
}
}