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Dec 26, 2025
| string local_name = address.substr(0, address.find('@')); | ||
| string domain_name = address.substr(address.find('@') + 1); | ||
| local_name.erase(std::remove(local_name.begin(), local_name.end(), '.'), local_name.end()); | ||
| local_name = local_name.substr(0, local_name.find('+')); |
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この行、substr で string を構築して、local_name = で元の文字列を破壊してコピーしているはずです。
local_name.erase くらいで済みそうですね。
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この問題：https://leetcode.com/problems/unique-email-addresses/description/
次に解く問題：https://leetcode.com/problems/first-unique-character-in-a-string/description/