any one help ee to solve the error in this code 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();
    }

    // Write your code here
    HashSet<String> pairs = new HashSet<>();

    for (int i = 0; i < t; i++) {
        // Create unique pair representation
        String pair = pair_left[i] + " " + pair_right[i];
        // Add to HashSet (automatically handles duplicates)
        pairs.add(pair);
        // Print current size after each addition
        System.out.println(pairs.size());
    }
}

}