During the interview, I began by describing the trie data structure, highlighting its efficiency in autocomplete scenarios. I implemented the insert and search methods, focusing on the complexity, which is O(n) for insert, where n is the length of the word.

While coding, I mistakenly mismanaged the child node assignments, leading to incorrect searches. The interviewer pointed this out, and I corrected my course.

I walked through adding autocomplete functionality, aiming for a clear, concise implementation. The interviewer asked about space complexities and trade-offs, which made me visibly scramble, as I hadn’t prepared deeply for those nuances.

Once I explained the space efficiency, the mood relaxed; however, I wasn’t quite able to complete the entire function before time was called. Overall, the interaction felt intellectually stimulating, albeit a little rocky, and I left with a sense of unfinished business.