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Java Hashset.java

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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());

}

}

}