Learn how to count the number of land cells in a grid that cannot reach the border by water. This…
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Learn how to solve the Surrounded Regions problem by marking all ‘O’s connected to the border via DFS, then flipping…
Learn how to solve the “01 Matrix” problem (LeetCode 542) by using a multi-source breadth-first search. We walk through the…
Learn how to solve the “Rotting Oranges” problem from LeetCode using a breadth-first search (BFS) approach. We walk through the…