def bellman_ford(g, w, s):
graph.init_single_source(g, s)
for i in range(1, len(g.vertices)):
for u,v in g.edges:
graph.relax(g.vertices[u], g.vertices[v], w)
for u,v in g.edges:
if g.vertices[v].d > g.vertices[u].d + w[(u,v)]:
return False
return True
def dijkstra(graph, weights, start_vertex):
graph_utils.init_single_source(graph, start_vertex)
queue = [vertex for vertex in graph.vertices.values()] # vertices to process
heapq.heapify(queue)
s = [] # set of vertices with shortest path already determined
while queue:
u = heapq.heappop(queue) # extract min
s.append(u)
for v in u.edges:
graph_utils.relax(u, v, weights)
def dijkstra(graph, weights, start_vertex):
graph_utils.init_single_source(graph, start_vertex)
queue = [vertex
for vertex in graph.vertices.values()] # vertices to process
heapq.heapify(queue)
s = [] # set of vertices with shortest path already determined
while queue:
u = heapq.heappop(queue) # extract min
s.append(u)
for v in u.edges:
graph_utils.relax(u, v, weights)