HackerRank-Solutions/Java/Data Structures/Java Hashset/Solution.java

//     Author: Rodney Shaghoulian
//     Github: github.com/RodneyShag
// HackerRank: hackerrank.com/RodneyShag

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());
        }
    }
}