PYTHON PROBLEM 159 · Interview-Level

Find a word-ladder length

Find the shortest valid sequence from hit to cog.

BFS · shortest path · LeetCode patternBFSshortest pathLeetCode pattern

PROBLEM OVERVIEW

What this Python exercise asks you to practise

This scenario tests find a word-ladder length. It belongs to the Graphs and Connectivity roadmap and uses the bfs · shortest path · leetcode pattern pattern.

Graph representation, BFS, DFS, shortest paths, topological order, and union-find.

COMPLETE WORKSPACE

Learn the plan, trace the logic and run the solution

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SKILL TO CARRY FORWARD

Pattern relevance

This exercise strengthens bfs · shortest path · leetcode pattern. Be ready to explain the input, the rule, the boundary cases, and why the chosen approach is appropriate.