What this Python exercise asks you to practise
This scenario tests find network delay time. It belongs to the Graphs and Connectivity roadmap and uses the dijkstra · min-heap · company screen pattern.
Graph representation, BFS, DFS, shortest paths, topological order, and union-find.
Learn the plan, trace the logic and run the solution
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This exercise strengthens dijkstra · min-heap · company screen. Be ready to explain the input, the rule, the boundary cases, and why the chosen approach is appropriate.