Given n stones on integer coordinates where a stone can be removed if it shares a row or column with another, compute the maximum number removable. Key insight: build a graph connecting stones that share a row/column, find its connected components (via DFS/Union-Find), and the answer is n minus the number of components.
Use esses exemplos para entender em que contexto ela costuma cair e adaptar sua prática.
Minimum Rooks in a Peaceful State: Given a 2D grid representing a chessboard with rooks, determine the minimum number of rooks that can be left on the board in a peaceful state after capturing as many rooks as possible. A peaceful state is defined as a state where no two rooks can capture each other (i.e., no two rooks share the same row or column).
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