The numeric labels at the vertices represent the current best known distance from the source vertex (home) to that specific vertex. A blue circle around a label indicates that this distance has been accepted as final for that vertex in the current run of the algorithm.
Conditions: The demonstration uses a visual whiteboard-style representation.; The source vertex is 'home'.; The algorithm is Dijkstra's shortest path algorithm.
The numeric labels at the vertices represent the current best known distance from the source vertex (home) to that specific vertex. A blue circle around a label indicates that this distance has been accepted as final for that vertex in the current run of the algorithm.
Conditions: The demonstration uses a visual whiteboard-style representation.; The source vertex is 'home'.; The algorithm is Dijkstra's shortest path algorithm.
To update the neighbors, you calculate the total distance from the source to each unvisited neighbor by adding the edge weight to the current circled vertex's distance. You then write these new distances next to the neighbors.
Conditions: There is a current circled (settled) vertex.; The vertex has neighbors that are not yet circled.; Edge weights are known and non-negative.
To update the neighbors, you calculate the total distance from the source to each unvisited neighbor by adding the edge weight to the current circled vertex's distance. You then write these new distances next to the neighbors.
Conditions: There is a current circled (settled) vertex.; The vertex has neighbors that are not yet circled.; Edge weights are known and non-negative.
When a vertex receives multiple distance calculations from different paths, you keep only the smallest value and cross out the larger ones. This ensures that the vertex's label always represents the shortest known distance from the source.
Conditions: A vertex is reachable via multiple paths from different circled vertices.; New distance calculations are performed for an already labeled vertex.
When a vertex receives multiple distance calculations from different paths, you keep only the smallest value and cross out the larger ones. This ensures that the vertex's label always represents the shortest known distance from the source.
Conditions: A vertex is reachable via multiple paths from different circled vertices.; New distance calculations are performed for an already labeled vertex.
The initialization step involves assigning a distance of 0 to the starting vertex (home) and marking it as visited by drawing a circle around it. All other vertices are initially considered to have an infinite or undefined distance until they are updated by neighbor calculations.
Conditions: The algorithm is starting.; The source vertex is identified as 'home'.
The initialization step involves assigning a distance of 0 to the starting vertex (home) and marking it as visited by drawing a circle around it. All other vertices are initially considered to have an infinite or undefined distance until they are updated by neighbor calculations.
Conditions: The algorithm is starting.; The source vertex is identified as 'home'.
The rule is to select the uncircled vertex with the smallest tentative distance label. This vertex is then circled to mark it as settled, and a predecessor arrow is drawn from the vertex that supplied this smallest distance.
Conditions: There are uncircled vertices with assigned distance labels.; The algorithm is in the selection phase after updating neighbors.
The rule is to select the uncircled vertex with the smallest tentative distance label. This vertex is then circled to mark it as settled, and a predecessor arrow is drawn from the vertex that supplied this smallest distance.
Conditions: There are uncircled vertices with assigned distance labels.; The algorithm is in the selection phase after updating neighbors.