[Leetcode] 929. Unique email addresses

The questions are as follows:

Every email consists of a local name and a domain name, separated by the @ sign.

For example, in[email protected],aliceIs the local name, andleetcode.comIs the domain name.

Besides lowercase letters, these emails may contain‘.‘S or‘+‘S.

If you add periods (‘.‘) Between some characters in the local name part of an email address, mail sent there will be forwarded to the same address without dots in the local name. For example,"[email protected]"And"[email protected]"Forward to the same email address. (Note that this rule does not apply for domain names .)

If you add a plus (‘+‘) In the local name, everything after the first plus sign will be ignored. This allows certain emails to be filtered, for example[email protected]Will be forwarded[email protected]. (Again, this rule does not apply for domain names .)

It is possible to use both of these rules at the same time.

Given a listemails, We send one email to each address in the list. How many different addresses actually receive mails?

 

Example 1:

Input: ["[email protected]","[email protected]","[email protected]"]Output: 2Explanation: "[email protected]" and "[email protected]" actually receive mails

 

Note:

• 1 <= emails[i].length <= 100
• 1 <= emails.length <= 100
• Eachemails[i]Contains exactly one‘@‘Character.

Solution:The passing rate of 82% is enough to prove how simple this question is. Replace '.' of the local name with '', and cut off the content after the first '+.

The Code is as follows:

class Solution(object):    def numUniqueEmails(self, emails):        """        :type emails: List[str]        :rtype: int        """        dic = {}        for i in emails:            e = i.split(‘@‘)            e[0] = e[0].replace(‘.‘,‘‘)            if ‘+‘ in e[0]:                e[0] = e[0][:e[0].index(‘+‘)]            if e[0] + ‘@‘ +  e[1] not in dic:                dic[e[0] + ‘@‘ +  e[1]] = 1        #print dic        return len(dic)

 

[Leetcode] 929. Unique email addresses