Learn how to count the number of distinct islands shape in a binary grid using DFS and shape hashing. Clear…
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Learn how to find all shortest paths (Word Ladder II) from one word to another by changing one letter at…
Learn how to solve the Word Ladder problem by building a BFS over words, changing one letter at a time.…
Learn how to count the number of land cells in a grid that cannot reach the border by water. This…