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g1701_1800.s1791_find_center_of_star_graph.readme.md Maven / Gradle / Ivy

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:**

![](https://assets.leetcode.com/uploads/2021/02/24/star_graph.png)

**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.