Word Ladder II Leetcode Solution

In this post, we are going to solve the Word Ladder II Leetcode Solution problem of Leetcode. This Leetcode problem is done in many programming languages like C++, Java, and Python.

Table of Contents

Problem

A transformation sequence from word beginWord to word endWord using a dictionary wordList is a sequence of words beginWord -> s₁ -> s₂ -> ... -> s_k such that:

Every adjacent pair of words differs by a single letter.

Every s_i for 1 <= i <= k is in wordList. Note that beginWord does not need to be in wordList.
s_k == endWord

Given two words, beginWord and endWord, and a dictionary wordList, return all the shortest transformation sequences from beginWord to endWord, or an empty list if no such sequence exists. Each sequence should be returned as a list of the words [beginWord, s₁, s₂, ..., s_k].

Example 1:

Input: beginWord = "hit", endWord = "cog", wordList = ["hot","dot","dog","lot","log","cog"]
Output: [["hit","hot","dot","dog","cog"],["hit","hot","lot","log","cog"]]
Explanation: There are 2 shortest transformation sequences:
"hit" -> "hot" -> "dot" -> "dog" -> "cog"
"hit" -> "hot" -> "lot" -> "log" -> "cog"

Example 2:

Input: beginWord = "hit", endWord = "cog", wordList = ["hot","dot","dog","lot","log"]
Output: []
Explanation: The endWord "cog" is not in wordList, therefore there is no valid transformation sequence.

Constraints:

1 <= beginWord.length <= 5
endWord.length == beginWord.length
1 <= wordList.length <= 500

wordList[i].length == beginWord.length
beginWord, endWord, and wordList[i] consist of lowercase English letters.
beginWord != endWord

All the words in wordList are unique.
The sum of all shortest transformation sequences does not exceed 10⁵

Now, let’s see the leetcode solution of Word Ladder II Leetcode Solution.

Word Ladder II Leetcode Solution in Python

Word Ladder II Leetcode Solution in CPP

Word Ladder II Leetcode Solution in Java

Note: This problem Word Ladder II is generated by Leetcode but the solution is provided by Chase2learn This tutorial is only for Educational and Learning purpose.