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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