def __bfs(g, src, parents):
q = Queue()
q.enqueue(src)
while not q.isempty():
cur = q.dequeue()
for succ in g.adjlists[cur]:
if parents[succ] is None:
parents[succ] = cur
q.enqueue(succ)
def __bfs_mat(g, src, parents):
q = Queue()
q.enqueue(src)
while not q.isempty():
cur = q.dequeue()
# For succ in g.adjlists[cur]
for succ in range(g.order):
if g.adj[cur][succ]:
if parents[succ] is None:
parents[succ] = cur
q.enqueue(succ)
def __bfs_path(g, src, dst, parents, dist):
g = Queue()
q.enqueue(src)
while not q.isempty():
cur = q.dequeue()
for succ in g.adjlists[cur]:
if parents[succ] is None:
parents[succ] = cur
dist[succ] = dist[cur] + 1
if succ == dst:
return
q.enqueue(succ)
def serialize_bfs(t):
q = Queue()
q.enqueue(t)
parents = [-1] * (t.key + 1)
while not q.isempty():
cur = q.dequeue()
for child in cur.children:
if child.key >= len(parents):
parents += [-1] * (child.key - len(parents) + 1)
parents[child.key] = cur.key
q.enqueue(child)
return parents
def width(t):
w, wcur = 0, 0
q = Queue()
q.enqueue(t)
q.enqueue(None)
while not q.isempty():
cur = q.dequeue()
if not cur:
w = max(w, wcur)
wcur = 0
if not q.isempty():
q.enqueue(None)
else:
wcur += 1
for child in cur.children:
q.enqueue(child)
return w
def width_bin(t):
w, wcur = 0, 0
q = Queue()
q.enqueue(t)
q.enqueue(None)
while not q.isempty():
cur = q.dequeue()
if not cur:
w = max(w, wcur)
wcur = 0
if not q.isempty():
q.enqueue(None)
else:
wcur += 1
child = cur.child
while child:
q.enqueue(child)
child = child.sibling
return w
def distance(g, src, dmin, dmax):
dist = [None] * g.order
q = Queue()
q.enqueue(src)
dist[src] = 0
last = 0
if dmin == 0:
print(src)
while not q.isempty():
cur = q.dequeue()
if dist[cur] >= dmin and dist[cur] != last:
print()
last = dist[cur]
if dist[cur] >= dmin - 1:
for s in range(g.order):
if g.adj[cur][s] and dist[dist] is None:
print(s, end=' ')
if dist[cur] < dmax - 1:
for s in range(g.order):
if g.adj[cur][s] and dist[s] is None:
dist[s] = dist[cur] + 1
q.enqueue(s)
print()
def dist_from_start(G, src, dmin, dmax):
parents = [None] * G.order
dist = 0
res = []
q = Queue()
q.enqueue(src)
q.enqueue(None)
parents[src] = -1
while not q.isempty():
cur = q.dequeue()
if cur is None:
if q.isempty():
return res
q.enqueue(None):
dist += 1
else:
if dist < dmax:
for succ in range(g.order):
if G.adj[cur][succ]:
if parents[succ] is None:
parents[succ] = curr
q.enqueue(succ)
if dist >= dmin - 1:
res.append(succ)
# ## BFS
#
#
#
# 15
# 3 8 9
# -6 10 11 2 5
# 0 4
#
# 2.2 question 3
# In[12]:
from algopy.queue import Queue
q = Queue()
for i in range(10):
q.enqueue(i)
while not q.isempty():
print(q.dequeue())
# In[13]:
def width(t):
w, wcur = 0, 0
q = Queue()
q.enqueue(t)
q.enqueue(None)
while not q.isempty():
cur = q.dequeue()