main.py123456789101112131415def solution (input):valid_emails. =for i in input:set()i = i.lowercase()name, domain i.split('@')currVal = name.split('+')[0].replace('.valid_emails.add(currVal + '@' + domain)return len(valid_emails)A user is trying to make a new Twitch account with their email. But Twitch has a problem with"bots": users that make spam accounts on Twitch under fake emails. In this problem, given a userwho tries to make an account with a certain number of emails, we want to determine how many ofthem are unique.Valid emails consist of a username and a domain. They are separated by the '@' sign. The emailsabide by certain rules:• Emails are case insensitive. This means that ninja@twitch.tv is the same email asNinja@twitch.tv and ninja@Twitch.tv.• In addition to letters and numbers, the email may contain one or more '.' or '+'.• If you add periods '.' between some characters in the username, this is equivalent to the sameaddress without dots in the username. Note that this rule does not apply to domain names.Example: ninja@twitch.tv is the same email as nin.ja@twitch.tv, but ninja@twitch.tv is not thesame as ninja@twi.tch.tv.If you add a plus '+' in the username, every character following it in the username will beignored. Note that this rule again does not apply to domain names. Example:ninja+1@twitch.tv is the same email as ninja+2@twitch.tv, but ninja@twitch.tv is not the sameas ninja@tw+tch.tv.• All of these rules can be used at the same time.Given an array of strings possible_emails, how many unique emails does it contain? You canassume that all strings you will receive will be a valid email, as defined above. Failed:Args: [["\"alexleet@code.com\"", \"alex@leetcode.com\"", \"a.lex.leet@code.com\"." \"alex+leet@leetcode.com\""]]Result: 3Expected result: 211:11Failed:Args: [["\"ninja@gmail.com\1.com\"ail.com\""1111111\"nin.ja@gmail.com\"1Result: 3Expected result: 111:1111NLION@lion.com\""]]Result: 6Expected result: 411\"ninja.+streamer@gmail.com\""]]11\"n.inja@gmail.com\'\"ninj.A@gmail.com\'111111 11Passed:Args: [["\"test.email+Alex@twitch.tv\"", "\"test.e.mail+Bob.Carol@twitch.tv\"", "\"testemail+David@twitch.tv\""]]Result: 1Failed:Args: [["\"ninja@twitch.tv\"", \"NiNjA@TwiTch. Tv\"", \"nINJA@tWITCH.TV\"", \"N1NJA@TWITCH.TV\"", \"NORTHERNLION@lion.com\"", \"NORTHERSummary: 2 tests passed, 3 tests failed.1111J1111\"ni.nja@gmai\"ninja.@gm11Passed:Args: [["\"a@twitch.tv\"", \"b@twitch.tv\"", \"c@twitch.tv\""]]Result: 311

This is very simple. Here I have attached the correct code that satisfies all the requirements as…

Answered: Given an array of strings…

Given an array of strings possible_emails, how many unique emails does it contain? You can assume that all strings you will receive will be a valid email, as defined above.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Array

The simplest way to start thinking about an array is as a collection, or a set of elements. In programming, these elements may be constants, variables, functions and pointers.

Question

main.py
1
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3
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11
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15
def solution (input):
valid_emails. =
for i in input:
set()
i = i.lowercase()
name, domain i.split('@')
currVal = name.split('+')[0].replace('.
valid_emails.add(currVal + '@' + domain)
return len(valid_emails)
A user is trying to make a new Twitch account with their email. But Twitch has a problem with
"bots": users that make spam accounts on Twitch under fake emails. In this problem, given a user
who tries to make an account with a certain number of emails, we want to determine how many of
them are unique.
Valid emails consist of a username and a domain. They are separated by the '@' sign. The emails
abide by certain rules:
• Emails are case insensitive. This means that ninja@twitch.tv is the same email as
Ninja@twitch.tv and ninja@Twitch.tv.
• In addition to letters and numbers, the email may contain one or more '.' or '+'.
• If you add periods '.' between some characters in the username, this is equivalent to the same
address without dots in the username. Note that this rule does not apply to domain names.
Example: ninja@twitch.tv is the same email as nin.ja@twitch.tv, but ninja@twitch.tv is not the
same as ninja@twi.tch.tv.
If you add a plus '+' in the username, every character following it in the username will be
ignored. Note that this rule again does not apply to domain names. Example:
ninja+1@twitch.tv is the same email as ninja+2@twitch.tv, but ninja@twitch.tv is not the same
as ninja@tw+tch.tv.
• All of these rules can be used at the same time.
Given an array of strings possible_emails, how many unique emails does it contain? You can
assume that all strings you will receive will be a valid email, as defined above.

Failed:
Args: [["\"alexleet@code.com\"", \"alex@leetcode.com\"", \"a.lex.le
et@code.com\"." \"alex+leet@leetcode.com\""]]
Result: 3
Expected result: 2
11:11
Failed:
Args: [["\"ninja@gmail.com\
1.com\"
ail.com\""
1
11
11
11
\"nin.ja@gmail.com\"
1
Result: 3
Expected result: 1
11:11
11
NLION@lion.com\""]]
Result: 6
Expected result: 4
11
\"ninja.+streamer@gmail.com\""]]
11
\"n.inja@gmail.com\'
\"ninj.A@gmail.com\'
11
11
11 11
Passed:
Args: [["\"test.email+Alex@twitch.tv\"", "\"test.e.mail+Bob.Carol@twitc
h.tv\"", "\"testemail+David@twitch.tv\""]]
Result: 1
Failed:
Args: [["\"ninja@twitch.tv\"", \"NiNjA@TwiTch. Tv\"", \"nINJA@tWITCH
.TV\"", \"N1NJA@TWITCH.TV\"", \"NORTHERNLION@lion.com\"", \"NORTHER
Summary: 2 tests passed, 3 tests failed.
11
11
J
11
11
\"ni.nja@gmai
\"ninja.@gm
11
Passed:
Args: [["\"a@twitch.tv\"", \"b@twitch.tv\"", \"c@twitch.tv\""]]
Result: 3
11

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