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Grokking the Coding Interview Patterns

Solution: Find Center of Star Graph

Understand how to find the center of a star graph by leveraging the property that the center node appears in every edge. This lesson teaches an efficient constant time approach by analyzing just the first two edges to determine the central node quickly.

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Statement

Given an array edges where each element edges[i] = [ui, vi] represents an edge between nodes ui and vi in an undirected star graph,A star graph is a graph where one central node is connected to every other node. If there are n nodes, then the central node must be connected to all other n-1 nodes. find the central node of this star graph.

Note: A star graph is a graph where one central node is connected to every other node. This implies that a star graph with n nodes has exactly n - 1 edges.

Constraints:

  • 3≤3 \leq n ≤103\leq 10^3 ...