929. Unique Email Addresses #24
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nanae772
reviewed
Sep 22, 2025
| for email in emails: | ||
| normalized_email = "" | ||
| has_plus_sign = False | ||
| for i, s in enumerate(email): |
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文字を表す変数にsを使われたのはなぜでしょうか？
個人的にはsは文字列という印象があるので、c, chあたりにするかなと思いました。
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ありがとうございます。確かにこれは c のほうが良いですね。
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| if s == ".": | ||
| continue |
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| normalized_emails.add(normalized_email) | ||
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| print(normalized_emails) |
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| local_part = local_part.split("+")[0] | ||
| local_part = local_part.replace(".", "") |
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以下のように一行で書くこともできそうです
Suggested change
| local_part = local_part.split("+")[0] | |
| local_part = local_part.replace(".", "") | |
| local_part = local_part.split("+")[0].replace(".", "") |
| local_part, domain_part = email.split("@") | ||
| local_part = local_part.split("+")[0] | ||
| local_part = local_part.replace(".", "") | ||
| return local_part + "@" + domain_part |
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以下のようにf-stringで書く方法もあります、個人的には形が分かりやすいのでf-stringの方が好みです
Suggested change
| return local_part + "@" + domain_part | |
| return f"{local_part}@{domain_part}" |
akmhmgc
reviewed
Sep 23, 2025
| return len(normalized_emails) | ||
| ``` | ||
| - 解答時間: 20:14 | ||
| - 時間計算量: $O(n^2)$ |
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文字列の個数と文字の長さは分けた方が良いのでO(M * N)などの記載が良いと思います
| class Solution: | ||
| def numUniqueEmails(self, emails: List[str]) -> int: | ||
| def canonicalize(email: str) -> str: | ||
| local_part, domain_part = email.split("@") |
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929. Unique Email Addresses
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