Question
A yoga studio received proposed class slots for its single room as [start, end] pairs — each occupying the half-open span [start, end), unsorted, possibly overlapping. The studio will cancel some proposals so that the surviving classes never overlap (back-to-back is fine). Return the minimum number of proposals it must cancel. Example: [[9,11],[10,12],[11,13]] requires 1 cancellation.
min_cancellations(proposals: list[list[int]]) → int[[[9,11],[10,12],[11,13]]]out1State 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.