Lesson·difficulty 2/5·~15 min
Keep one result per request
Read the task → edit your code → Run to see the output → Run tests to check your answer.
Implement unique_requests(request_ids).
Return unique string request IDs in their original first-seen order. Do not sort and do not mutate the input. This models identifying repeated deliveries of a logical request.
Before coding, predict one result by hand. After the tests pass, explain your approach and add a boundary example of your own.
Tests
- Case 1
- Case 2
- Case 3
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