20. Topological Sort Introduction
Easy

Problem Statement

Introduction to Topological Sort in Directed Acyclic Graphs (DAG). Linear ordering of vertices such that for every directed edge u -> v, vertex u comes before v.

Examples

1Example 1
Input:
{}
Output:
null
2Example 2
Input:
{}
Output:
null
3Example 3
Input:
{}
Output:
null
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