Question
A parking garage logs each car's visit as [arrive, depart] in minutes; a car holds a spot for the half-open span [arrive, depart), so a car arriving exactly as another departs can take over that spot. Given all visits for a day, return the minimum number of spots the garage needed — equivalently, the maximum number of cars present at any single moment. Example: [[0,30],[5,10],[15,20]] needs 2 spots.
min_spots(visits: list[list[int]]) → int[[[0,30],[5,10],[15,20]]]out2State 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.
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.