Minimal Vertices
Application of Topological Sort, Strongly Connected Components and Tarjan's Algorithm

Algorithms and Data Structures: TheAlgorist.com

System Design: www.System.Design

Low Level Design: LowLevelDesign.io

Frontend Engineering: FrontendEngineering.io
জয় শ্রী রাম
🕉
Problem Statement:
Given a directed graph G , find the minimum number of vertices from which all nodes are reachable.
For example:
0<1 _ \ / _\ / 2  \ / 3 _ / \ /_ \ 4>5
The above graph would have only one 1 minimal vertex: either vertex 1, 2 or 3. You can reach all the vertices if you 'start traversing from either vertex 1 , 2 or 3.
0<1 _ \ / _\ / 2 / \  3  \ / 6 _ / \ /_ \ 4>5For the above graph all the nodes are reachable from vertex 3.
Tag(s): #airbnb_interview
Solution:
Algorithm:Login to Access Content
Working Solution:
Java code:
Login to Access Content
Python code:
Login to Access Content
Don't forget to take a look at other interesting Graph Problems:
 How to Send Message to Entire Social Network
 Disconnected Network
 Critical Connection
 Course Scheduling