23. Directed Acyclic Graphs (DAGs)
Directed Acyclic Graphs (DAGs) present a vital framework for managing tasks with dependencies, ensuring tasks are completed in the correct order without cycles. The fundamental challenge explored is sequencing tasks based on their constraints, utilizing graph representations. The chapter delves into the properties of DAGs and introduces the concept of topological sorting as a systematic method to achieve valid task ordering.
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What we have learnt
- Directed Acyclic Graphs (DAGs) do not have cycles and have directed edges representing task dependencies.
- Topological sorting sequences tasks while respecting their dependencies indicated by directed edges.
- Every DAG contains at least one vertex with an in-degree of zero, which serves as a starting point for task enumeration.
Key Concepts
- -- Directed Acyclic Graph (DAG)
- A directed graph with no directed cycles; it allows one-way relationships between tasks without circular dependencies.
- -- Topological Sorting
- The linear ordering of vertices in a DAG such that for every directed edge u -> v, vertex u comes before vertex v in the ordering.
- -- Indegree
- The number of incoming edges directed into a vertex in a graph, representing the dependencies needed to complete a task.
- -- Outdegree
- The number of outgoing edges directed from a vertex in a graph, indicating the tasks dependent on it.
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