Your question is Jigsaw Puzzle OOD. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
OOP design of a jigsaw puzzle. Imagine you want to solve a rectangular jigsaw puzzle. What classes and relationships do you need? Design an algo for solving the actual puzzle
Asked in the phone interview stage. First question. Treat this as a practical design exercise: explain the object model, matching logic, and how the solver handles ambiguity and invalid placements.