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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; ...