First submission per student
An online quiz logs every submission in arrival order as rows "student,answer". Only a student's FIRST submission counts; later ones are ignored. Return the counting rows — one per student, the first they sent — in the order those students first appeared. Example: ["ava,B", "raj,C", "ava,D"] gives ["ava,B", "raj,C"].
Implement
first_submissions(rows: list[str]) → list[str]Examples
in
[["ava,B","raj,C","ava,D"]]out["ava,B","raj,C"]What a strong answer looks like
State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.
0:00 of about 11 min
solution.py
InputExpectedGot
[["ava,B","raj,C","ava,D"]]["ava,B","raj,C"]not run yetsample