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Quick Summary

Simulate a 2D grid where rectangles are stacked based on insertion order.
Support adding new rectangles, removing existing ones, and querying the topmost visible rectangle at any coordinate.
Handle overlapping regions efficiently while maintaining strict insertion-based layering rules.

What This Tests

Object-Oriented Design
State Management
Coordinate Geometry
Time-Space Tradeoffs

Common Patterns

Hashing

Stack

Test Cases

Input

Output

Expected