hackerrank/Java/Data-Structure/Hashset.java at master · SedaKunda/hackerrank

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You are given n pairs of strings. Two pairs (a,b) and (c,d) are identical if a=c and b=d. That also implies (a,b) is not same as (b,a). After taking each pair as input, you need to print number of unique pairs you currently have.

Note: Brute force solution will not earn full points.

import java.io.*;

import java.util.*;

import java.text.*;

import java.math.*;

import java.util.regex.*;

public class Hashset {

public static void main(String[] args) {

/* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */

Scanner s = new Scanner(System.in);

int sum = s.nextInt();

s.nextLine();

HashSet hs = new HashSet();

for (int i=0;i <sum;i++) {

hs.add(s.nextLine());

System.out.println(hs.size ());

}

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