[LeetCode] 138: Word Ladder II
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[Problem]
[Solution]
Given two words (start and end), and a dictionary, find all shortest transformation sequence(s) from start to end, such that:
- Only one letter can be changed at a time
- Each intermediate word must exist in the dictionary
For example,
Given:
start = "hit"
end = "cog"
dict = ["hot","dot","dog","lot","log"]
Return
[ ["hit","hot","dot","dog","cog"], ["hit","hot","lot","log","cog"] ]
Note:
- All words have the same length.
- All words contain only lowercase alphabetic characters.
[Solution]
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