Lecture-8 127. Word Ladder | Graph Traversal | Graph Series | DSA | Hindi 

Problem Name:
127. Word Ladder
Problem Statement:
A transformation sequence from word beginWord to word endWord using a dictionary wordList is a sequence of words beginWord - s1 - s2 - ... - sk such that:
Every adjacent pair of words differs by a single letter.
Every si for 1 = i = k is in wordList. Note that beginWord does not need to be in wordList.
sk == endWord
Given two words, beginWord and endWord, and a dictionary wordList, return the number of words in the shortest transformation sequence from beginWord to endWord, or 0 if no such sequence exists.
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