Question
You are given two lists of closed intervals, A and B, each already sorted by start and each internally disjoint (no two intervals within the same list overlap). Return the list of all intersections between an interval of A and an interval of B, as closed intervals, sorted by start. A point-overlap like [5,5] is a valid intersection. Either list may be empty.
interval_intersections(A: list[list[int]], B: list[list[int]]) → list[list[int]][[[0,2],[5,10],[13,23],[24,25]],[[1,5],[8,12],[15,24],[25,26]]]out[[1,2],[5,5],[8,10],[15,23],[24,24],[25,25]]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.
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.