Solution: Word Ladder II
Explore how to solve the Word Ladder II problem by combining breadth-first search for shortest path discovery and backtracking for reconstructing all shortest transformation sequences. Understand the efficient use of parent maps and set operations to handle word transformations and generate valid paths.
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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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