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Grokking the Coding Interview Patterns in Python

Solution: Find Center of Star Graph

Explore how to find the center of a star graph by examining connections between nodes. Understand why the center appears in multiple edges and apply a constant time solution that checks only two edges. This lesson helps you leverage graph structure for efficient problem solving.

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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 ...