Solution: Word Ladder II
Explore the solution to Word Ladder II by understanding how BFS discovers shortest paths and DFS backtracks to reconstruct all shortest transformation sequences from beginWord to endWord, working within constraints on word changes and dictionary lookups.
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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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