1791. Find Center of Star Graph

https://leetcode.com/problems/find-center-of-star-graph

Description

There is an undirected star graph consisting of n nodes labeled from 1 to n. A star graph is a graph where there is one center node and exactly n - 1 edges that connect the center node with every other node.

You are given a 2D integer array edges where each edges[i] = [ui, vi] indicates that there is an edge between the nodes ui and vi. Return the center of the given star graph.

Example 1:

**Input:** edges = [[1,2],[2,3],[4,2]]
**Output:** 2
**Explanation:** As shown in the figure above, node 2 is connected to every other node, so 2 is the center.

Example 2:

**Input:** edges = [[1,2],[5,1],[1,3],[1,4]]
**Output:** 1

Constraints:

• 3 <= n <= 105

• edges.length == n - 1

• edges[i].length == 2

• 1 <= ui, vi <= n

• ui != vi

• The given edges represent a valid star graph.

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