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資訊專(zhuān)欄INFORMATION COLUMN

1.過(guò)濾郵箱地址

caiyongji / 705人閱讀

摘要：題目初始算法測(cè)試提交優(yōu)化算法利用的去重利用正則和是一個(gè)特殊字符所以需要轉(zhuǎn)義符代表在之后的所有字符代表結(jié)尾代表或代表在全局用替代開(kāi)始到結(jié)尾的字符和

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

For example, in [email protected], alice is the local name, and leetcode.com is 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 to [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 list of emails, 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: 2
Explanation: "[email protected]" and "[email protected]" actually receive mails

Note:

1 <= emails[i].length <= 100
1 <= emails.length <= 100
Each emails[i] contains exactly one "@" character.

初始算法

class Solution:
    def numUniqueEmails(self, emails: List[str]) -> int:
        n = len(emails)
        final_list = []
        for i in range(0, n):
            split_list =  emails[i].split("@")
            local_name, domain_name = split_list[0].split("."), split_list[1]
            local_name = "".join(local_name).split("+")[0]
            final_name = local_name + "@" + domain_name
            if(final_name not in final_list):
                final_list.append(final_name)        
        return len(final_list)
測(cè)試提交 Runtime: 52 ms, faster than 55.04% of Python3 online submissions
for Unique Email Addresses. Memory Usage: 13.2 MB, less than 5.79% of
Python3 online submissions for Unique Email Addresses.

優(yōu)化算法

利用python的set去重

class Solution:
    def numUniqueEmails(self, emails):
        """
        :type emails: List[str]
        :rtype: int
        """
        email_set = set()
        for email in emails:
            local_name,domain_name = email.split("@")
            local_name ="".join(local_name.split("+")[0].split("."))
            email = local_name +"@" + domain_name
            email_set.add(email)
        return len(email_set)

Js利用正則和Set

const numUniqueEmails = emails => new Set(emails.map(mail => `${mail.split("@")[0].replace(/+.*$|./g, "")}@${mail.split("@")[1]}`)).size

is a specail char, so adds .

.* means any character after +.
$, in regex, it represents the end of string.
| equals to or.
. is also a special char, so adds .
In the end of regex, g, global search, means finding all matches in input and replace them.
In sum, replace the substring that after sign + or the char . with empty string.

1.+是一個(gè)特殊字符所以需要轉(zhuǎn)義符
2..*代表在+之后的所有字符
3.$代表結(jié)尾
4.|代表或
5.replace(/+.*$|./g, "")代表在全局用""替代+開(kāi)始到結(jié)尾的字符和.

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