def prim( paths ):
data = Data_Manager()
conn = defaultdict( list )
start = data.get_start()
#don't change (12, 16, 17, 21) starting cities
for x in start:
visited = []
path = []
visited.append(x)
#append start city key
connections = data.get_conn(x)
#(weight, type, connect)
heapq.heapify(connections)
while connections:
#(weight, type, Connection)
cost, c1, c2 = heapq.heappop(connections)
if c2 not in visited:
visited.append(c2)
path.append((c1, c2, cost))
for x in data.get_conn(c2):
heapq.heappush(connections, x)
paths.append(path)
#for path in paths:
#for x in path:
#print(str.format("({0:3}, {1:3}, {2:5.4}), ", x[0], x[1], x[2]), end = "")
#print()
allPaths = []
for x in paths:
allPaths.append(_draw_paths(x))
return allPaths
def dijkstra(start, end):
data = Data_Manager()
cities = data.get_cities()
D = {}
P = {}
for city in cities:
D[city] = float('inf')
P[city] = ""
D[start] = 0
remain_cities = cities
while len(remain_cities) > 0:
short = None
city = ''
for x in remain_cities:
if short == None:
short = D[x]
city = x
elif D[x] < short:
short = D[x]
city = x
remain_cities.remove(city)
connects = data.get_conn(city)
for x in connects:
#|||(weight, type, cost, time)
if x[1] == city:
if D[x[2]] == float('inf'):
D[x[2]] = D[city] + x[0]
P[x[2]] = city
elif D[x[2]] > D[city] + x[0]:
D[x[2]] = D[city] + x[0]
P[x[2]] = city
path = []
node = end
while node != start:
if path.count(node) == 0:
path.insert(0, node)
node = P[node]
else:
break
path.insert(0, start)
return (D[end], path)
