└── HashSet


/HashSet:
--------------------------------------------------------------------------------
 1 | import java.io.*;
 2 | import java.util.*;
 3 | public class HashSet{
 4 |  public static void main(String[] args) {
 5 |         Scanner s = new Scanner(System.in);
 6 |         int t = s.nextInt();
 7 |         String [] pair_left = new String[t];
 8 |         String [] pair_right = new String[t];
 9 |         for (int i = 0; i < t; i++) {
10 |             pair_left[i] = s.next();
11 |             pair_right[i] = s.next();
12 |         }
13 | s.close();
14 |         HashSet<String> set = new HashSet(t);
15 |         for (int i = 0; i < t; i++) {
16 |             set.add(pair_left[i] + " " + pair_right[i]);
17 |             System.out.println(set.size());
18 |         }
19 |     }
20 | }
21 | 


--------------------------------------------------------------------------------