Encode and Decode TinyURL

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class Codec:

    def __init__(self):
        # Using a list to keep track of original URLs.
        self.urls = []

    def encode(self, longUrl: str) -> str:
        """Encodes a URL to a shortened URL.
        """
        # Append the longUrl to the list and use the index as the tiny URL.
        self.urls.append(longUrl)
        return str(len(self.urls) - 1)

    def decode(self, shortUrl: str) -> str:
        """Decodes a shortened URL to its original URL.
        """
        # Convert the tiny URL back to an index and return the corresponding longUrl.
        return self.urls[int(shortUrl)]