Code Room
CodingHard
Question
You are given k sorted (ascending) integer lists, provided as a list of lists. Merge them into a single ascending-sorted list and return it. There are 1 to 10^4 lists with a total of up to 10^5 elements across all lists; individual values fit in 32-bit signed range. Aim for an approach better than concatenate-then-sort.
Implement
merge_k_sorted(lists: list[list[int]]) → list[int]Examples
in
[[[1,4,5],[1,3,4],[2,6]]]out[1,1,2,3,4,4,5,6]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.
Learn the concepts
Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.
Run or narrate your approach, then ask the coach.