HackerRank 30 Days Of Code Challenge, Day28(Ques 29 in Java)

 

Objective
Today, we're working with regular expressions. Check out the Tutorial tab for learning materials and an instructional video!

Task
Consider a database table, Emails, which has the attributes First Name and Email ID. Given  rows of data simulating the Emails table, print an alphabetically-ordered list of people whose email address ends in .

Input Format

The first line contains an integer, , total number of rows in the table.
Each of the  subsequent lines contains  space-separated strings denoting a person's first name and email ID, respectively.

Constraints

• Each of the first names consists of lower case letters  only.
• Each of the email IDs consists of lower case letters ,  and  only.
• The length of the first name is no longer than 20.
• The length of the email ID is no longer than 50.

Output Format

Print an alphabetically-ordered list of first names for every user with a gmail account. Each name must be printed on a new line.

Sample Input

6
riya riya@gmail.com
julia julia@julia.me
julia sjulia@gmail.com
julia julia@gmail.com
samantha samantha@gmail.com
tanya tanya@gmail.com

Sample Output

julia
julia
riya
samantha
tanya

Answer:

import java.util.ArrayList;

import java.util.Collections;

import java.util.Scanner;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class Solution {

    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);

        int N = in.nextInt();

        String emailRegEx = ".+@gmail\\.com$";

        Pattern pattern = Pattern.compile(emailRegEx);

        ArrayList<String> list = new ArrayList<>();

        for (int i = 0; i < N; i++) {

            String name = in.next();

            String email = in.next();

            Matcher matcher = pattern.matcher(email);

            if (matcher.find()) list.add(name);

        }

        Collections.sort(list);

        list.forEach(System.out::println);

    }

}

Now just submit the code and just submit the code