Solution: Word Ladder II
Explore how to solve the Word Ladder II problem by applying BFS to find shortest paths and DFS backtracking to reconstruct all valid transformation sequences from beginWord to endWord. Understand the use of parent mappings to efficiently generate paths and manage complexity within given constraints.
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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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