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Snowflake
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Quick Summary
Simulate gravity-based piece placement in a 2D grid column.
Maintain efficient state tracking to locate drop positions without scanning.
Return an independent deep copy of the board after each operation.
What This Tests
2D array manipulation and direct indexing
Auxiliary data structures for O(1) state updates
Deep copying and immutable snapshots
Boundary condition handling for full columns
Common Patterns
Matrix
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