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Quick Summary
Calculate the minimum removals needed to clear all balls from a 2D plane.
Balls connect when sharing an axis and within a maximum distance threshold d.
Each removal clears a ball and its entire transitive connected group.
What This Tests
Graph connectivity and component identification
Disjoint Set Union (Union-Find) data structure application
Efficient spatial grouping and coordinate processing
Sorting and linear neighbor scanning
Common Patterns
Union Find
Sorting
Hashing
Collapse
Hint 1
Hint 2
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Input
balls =
d =
Output
Expected
