Solution: Word Ladder II
Explore how to solve the Word Ladder II problem by using breadth-first search to identify shortest transformation sequences and depth-first search backtracking for reconstructing all valid shortest paths from beginWord to endWord. Understand the algorithm's two-phase approach, complexity, and practical implementation.
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Statement
You are given two words, beginWord and endWord, and a dictionary of words called wordList. Your task is to find all the shortest transformation sequences from beginWord to endWord, such that:
Only one letter can be changed at a time.
Each transformed word must exist in the given
wordList.The transformation sequence must begin with
beginWordand end withendWord.
Return all the shortest transformation sequences as a list of lists. If no valid transformation exists, return an empty list.
Constraints:
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