# How is the Dijkstra algorithm used in a graph?

## How is the Dijkstra algorithm used in a graph?

Dijkstra algorithm is a greedy algorithm. It finds a shortest-path tree for a weighted undirected graph. This means it finds the shortest paths between nodes in a graph, which may represent, for example, road networks For a given source node in the graph, the algorithm finds the shortest path between the source node and every other node.

## How to use Dijkstra’s adjacency matrix in Java?

In this article we will see its implementation using adjacency matrix. We strongly recommend reading – Dijkstra algorithm and how it works. Ordering – Searching (Get the vertex with minimum distance among all vertices) Start with the empty Shortest Path Tree (SPT). Maintain a set SPT [] to keep track to vertices included in SPT.

**How to pick a vertex in Dijsktra algorithm?**

Let us understand with the following example: The set sptSet is initially empty and distances assigned to vertices are {0, INF, INF, INF, INF, INF, INF, INF} where INF indicates infinite. Now pick the vertex with minimum distance value. The vertex 0 is picked, include it in sptSet.

**How is the shortest distance calculated in Dijsktra?**

Array dist [] is used to store shortest distance values of all vertices. 1) The code calculates shortest distance, but doesn’t calculate the path information. We can create a parent array, update the parent array when distance is updated (like prim’s implementation) and use it show the shortest path from source to different vertices.

The algorithm finds the shortest path between a node and all other nodes in a graph with weighted edges. The greatest thing about it is how simple and efficient it is: there are only 6 steps, and no one has found a more efficient method to solve the shortest path problem. We start with a graph with weighted edges.

### Which is an example of Dijkstra’s shortest path?

(D) — Dad’s position. For example, in the ice rink at right, the shortest path is 18 steps. 20 imes 20 20×20. The rinks are separated by hyphens. 20 imes 20 20×20 ice rinks. Note: Sally has to stop at her father’s position. She will slide past him if there are no walls. Skiena, S. Dijkstra’s Algorithm Animation .