public class Solution
extends Object
1791 - Find Center of Star Graph\.
Easy
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.