DEV Community

Cover image for 1791. Find Center of Star Graph
MD ARIFUL HAQUE
MD ARIFUL HAQUE

Posted on • Edited on

1791. Find Center of Star Graph

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:

star_graph

  • 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.

Solution:

class Solution {

    /**
     * @param Integer[][] $edges
     * @return Integer
     */
    function findCenter($edges) {
        return $edges[0][0] == $edges[1][0] || $edges[0][0] == $edges[1][1]
               ? $edges[0][0]
               : $edges[0][1];
    }
}
Enter fullscreen mode Exit fullscreen mode

Contact Links

If you found this series helpful, please consider giving the repository a star on GitHub or sharing the post on your favorite social networks 😍. Your support would mean a lot to me!

If you want more helpful content like this, feel free to follow me:

Image of AssemblyAI tool

Challenge Submission: SpeechCraft - AI-Powered Speech Analysis for Better Communication

SpeechCraft is an advanced real-time speech analytics platform that transforms spoken words into actionable insights. Using cutting-edge AI technology from AssemblyAI, it provides instant transcription while analyzing multiple dimensions of speech performance.

Read full post

Top comments (0)

AWS Security LIVE!

Tune in for AWS Security LIVE!

Join AWS Security LIVE! for expert insights and actionable tips to protect your organization and keep security teams prepared.

Learn More

👋 Kindness is contagious

Explore a sea of insights with this enlightening post, highly esteemed within the nurturing DEV Community. Coders of all stripes are invited to participate and contribute to our shared knowledge.

Expressing gratitude with a simple "thank you" can make a big impact. Leave your thanks in the comments!

On DEV, exchanging ideas smooths our way and strengthens our community bonds. Found this useful? A quick note of thanks to the author can mean a lot.

Okay