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Java Hashset Hackerrank Solution

 Java Hashset Hackerrank Solution

For Explanation Watch Video:


Sample Input

5
john tom
john mary
john tom
mary anna
mary anna

Sample Output

1
2
2
3
3
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();
        }
        HashSet<String> hs = new HashSet<>();
        for (int i = 0; i < t; i++) {
            String str = pair_left[i] +" "+pair_right[i] ;
            hs.add(str);
            System.out.println(hs.size());
        }
   }
}

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