26. Shortest Paths in Weighted Graphs
The chapter focuses on the computation of shortest paths in weighted graphs, detailing techniques like Dijkstra's algorithm that efficiently determine minimum cost routes between vertices. It contrasts the single-source shortest path problem with the all-pairs shortest path problem and highlights practical applications in transportation and logistics. Understanding these algorithms is essential for problem-solving in various graph-related applications.
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What we have learnt
- Weighted graphs assign costs to edges and require specialized algorithms for shortest path calculations.
- Dijkstra's algorithm is a systematic way to compute the shortest path from a single source to all other vertices.
- The shortest path in a weighted graph does not necessarily correspond to the path with the fewest edges.
Key Concepts
- -- Weighted Graphs
- Graphs where edges have cost associated with them, often used to represent various metrics such as distance, time, or price between vertices.
- -- Dijkstra's Algorithm
- A greedy algorithm used for finding the shortest path from a source vertex to all other vertices in a weighted graph with non-negative weights.
- -- Singlesource Shortest Path Problem
- A problem that seeks to identify the shortest paths from a single source vertex to all other vertices in a graph.
- -- Allpairs Shortest Path Problem
- A problem that involves finding the shortest paths between every pair of vertices in a graph.
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