def has_backup_path(self):
for node in self.nodes:
self.nodes[node].dist = float("inf")
self.nodes[node].pre = None
self.nodes[node].pre_door = None
self.source.dist = 0
que = Queue()
que.enqueue(self.source)
while que.size():
first = que.dequeue()
if first == self.exit_node:
if self.max_exit_dist < first.dist:
self.max_exit_dist = first.dist
return True
for key in first.connections:
neighbour = self.nodes[key]
vertex = first.room + self.delimiter + key
if self.vertices[vertex].capacity - self.vertices[vertex].flow:
if first.dist + 1 < neighbour.dist:
neighbour.dist = first.dist + 1
neighbour.pre = first
neighbour.pre_vertex = self.vertices[vertex]
que.enqueue(neighbour)
return False
def bfs_walk(self):
que = Queue()
que.enqueue(next(iter(self.nodes.values())))
while que.size() > 0:
first = que.dequeue()
if first.mark:
continue
else:
print(first.name)
first.mark = True
for neighbour in first.connections:
que.enqueue(self.nodes[neighbour])
def test_queue():
q = Queue([48, 3])
q.enqueue(10)
q.enqueue(15)
q.enqueue(20)
q.enqueue(25)
print(q.indexof(25))
print(q)
q.clear()
# q.pop()
print(q._head, q._tail)
print(q)
q.enqueue(25)
q.dequeue()
print(q)
def path_exists(g, start, target):
start = g[start]
queue = Queue()
for child in start:
queue.enqueue(child)
for child in queue:
if child.seen:
return
if child == target:
return True
else:
child.seen = True
for child_of_child in child:
queue.enqueue(child_of_child)
else:
return False
def print_level_order(self):
q = Queue()
tmp = OrderedDict()
for index in range(self.get_height(), -2, -1):
tmp[index] = []
q.enqueue(self.node)
level = 0
while q.size() > 0:
actual = q.dequeue()
if actual:
if level != actual.level:
level = actual.level
tmp[level].append(str(actual.key))
if actual.left:
q.enqueue(actual.left.node)
if actual.right:
q.enqueue(actual.right.node)
parent = actual
else:
if parent:
if parent.left.node or parent.right.node:
tmp[level - 1].append("_")
if not parent.left.node and not parent.right.node:
tmp[level - 1].append("_")
parent = actual
else:
tmp[level - 1].append("_")
result = self.format_avl(tmp)
print(result)