Test case 5 has failed in my case.

This is my code that I wrote:- import java.io.; import java.util.; import java.text.; import java.math.; import java.util.regex.*;

public class Solution { public static void main(String[] args) { Scanner s = new Scanner(System.in); int t = s.nextInt(); String [] pair_left = new String[t]; String [] pair_right = new String[t];

    for (int i = 0; i < t; i++) {
        pair_left[i]  = s.next();
        pair_right[i] = s.next();
    }
    s.close();

    HashSet<String> set = new HashSet(t);
    for (int i = 0; i < t; i++) {
        set.add(pair_left[i] + " " + pair_right[i]);
        System.out.println(set.size());
    }
}

}