01
Design a data structure that supports several active trips at once — each containing multiple custom groups (like "Beach Bag" or "Kids' Suitcase") with their own item checklists — while keeping everything organized by upcoming dates and instantly accessib
Built a nested, well-indexed data model (Trips → Packing Groups → Items) with date-based sorting logic, enabling smooth management of unlimited trips and lists in one centralized hub with real-time updates.




