Looks easy until you start thinking about edge cases.
Clarify constraints (e.g., delimiter choice, escaping, empty strings, Unicode) and then design a length-prefixed encoding to avoid ambiguity. Implement serialize by concatenating length and string with a delimiter, and deserialize by parsing lengths and extracting substrings. Discuss trade-offs between simplicity and robustness.
Pro tip: Mention that length-prefixing is more robust than delimiter-based encoding because it handles arbitrary strings including delimiters and empty strings. Also, consider using a single delimiter like '#' after the length to simplify parsing.
Ask about input size, character set, whether strings can contain any characters, and if the serialized format needs to be human-readable. This determines the encoding strategy.
Decide between delimiter-based (with escaping) or length-prefixed encoding. Length-prefixed is generally safer and simpler to parse.
For each string, append its length, a delimiter (e.g., '#'), and the string itself. Concatenate all into a single string.
Parse the serialized string by reading digits until the delimiter to get the length, then extract that many characters as the next string. Repeat until the end.
Test with empty list, empty strings, strings containing delimiters, and Unicode characters. Discuss time/space complexity and potential improvements.
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