def newDijkstra(graph, s):
"""
Crea una busqueda Dijkstra para un digrafo y un vertice origen
"""
prime = nextPrime (g.numVertex(graph) * 2)
search = {'graph':graph, 's':s, 'visitedMap':None, 'minpq':None}
search['visitedMap'] = map.newMap(capacity=prime, maptype='PROBING', comparefunction=graph['comparefunction'])
vertices = g.vertices (graph)
itvertices = it.newIterator (vertices)
while (it.hasNext (itvertices)):
vert = it.next (itvertices)
map.put (search['visitedMap'], vert, {'marked':False,'edgeTo':None,'distTo':math.inf})
map.put(search['visitedMap'], s, {'marked':True,'edgeTo':None,'distTo':0})
pq = minpq.newIndexMinPQ(g.numVertex(graph), comparenames)
search['minpq'] = pq
minpq.insert(search['minpq'], s, 0)
while not minpq.isEmpty(search['minpq']):
v = minpq.delMin(pq)
if not g.containsVertex(graph,v):
raise Exception("Vertex ["+v+"] is not in the graph")
elif g.containsVertex(graph, v):
adj = g.adjacents(graph,v)
adj_it = it.newIterator(adj)
while it.hasNext(adj_it):
w = it.next(adj_it)
edge = g.getEdge(graph, v, w)
relax(search, edge)
# obtener los enlaces adjacentes de v
# Iterar sobre la lista de enlaces
# Relajar (relax) cada enlace
return search
def test_addEdges(self):
graph = g.newGraph(7, self.comparenames)
g.insertVertex(graph, 'Bogota')
g.insertVertex(graph, 'Yopal')
g.insertVertex(graph, 'Cali')
g.insertVertex(graph, 'Medellin')
g.insertVertex(graph, 'Pasto')
g.insertVertex(graph, 'Barranquilla')
g.insertVertex(graph, 'Manizales')
g.addEdge(graph, 'Bogota', 'Yopal')
g.addEdge(graph, 'Bogota', 'Medellin')
g.addEdge(graph, 'Bogota', 'Pasto')
g.addEdge(graph, 'Bogota', 'Cali')
g.addEdge(graph, 'Yopal', 'Medellin')
g.addEdge(graph, 'Medellin', 'Pasto')
g.addEdge(graph, 'Cali', 'Pasto')
g.addEdge(graph, 'Cali', 'Barranquilla')
g.addEdge(graph, 'Barranquilla', 'Manizales')
g.addEdge(graph, 'Pasto', 'Manizales')
self.assertEqual(g.numEdges(graph), 10)
self.assertEqual(g.numVertex(graph), 7)
lst = g.vertices(graph)
self.assertEqual(lt.size(lst), 7)
lst = g.edges(graph)
self.assertEqual(lt.size(lst), 10)
degree = g.degree(graph, 'Bogota')
self.assertEqual(degree, 4)
edge = g.getEdge(graph, 'Bogota', 'Medellin')
lst = g.adjacents(graph, 'Bogota')
self.assertEqual(lt.size(lst), 4)