PYTHON PROBLEM 325 · Interview-Level

Infer an alien alphabet: Valid alien order

Infer one deterministic character order from a sorted alien dictionary.

topological sort · string · hardtopological sortstringhard

PROBLEM OVERVIEW

What this Python exercise asks you to practise

This scenario tests infer an alien alphabet. It belongs to the Graphs and Connectivity roadmap and uses the topological sort · string · hard 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 topological sort · string · hard. Be ready to explain the input, the rule, the boundary cases, and why the chosen approach is appropriate.