How do you group anagrams together from a list of strings?
PICTURE THIS: HASH MAP
Simple meaning
For each word, sort its characters or count letters as a hash key and append the word to a map of lists.
WHY — Strings instead of guessing?
Why interviewers care about Strings:
question about Strings.
trade-offs, and what you would actually do on a DSA project - not buzzwords.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1For each word, sort
its characters or count letters as a hash key and append the word to a map of lists.
- 2Sorting keys is O(n
* k log k) for n words of length k
- 3count keys are O(n
* k) with O(n k) space for the groups.
- 4Give an example
Return the map values.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
For each word, sort its characters or count letters as a hash key and append the word to a map of lists. Sorting keys is O(n * k log k) for n words of length k