煉錶筆試題

反轉鍊錶

# 節點

class
node
(object):
def__init__
(self, elem)
: self.elem = elem
self.
next
=none
# 鍊錶
class
singlelist
(object):
def__init__
(self, head)
: self.head = head
# 反轉鍊錶
defreversesinglelist
(self, head)
:if head ==
none
or head.
next
==none
:return
l, m, r = head, head.
next
, head.
next
.next
while r:
m.next
= l l = m
m = r
r = r.
next
m.next
= l return m
if __name__ ==
'__main__'
: head = node(1)
head.
next
= node(2)
head.
next
.next
= node(3)
head.
next
.next
.next
= node(4)
print
("原鍊錶："
)print
(head.elem)
print
(head.
next
.elem)
print
(head.
next
.next
.elem)
print
(head.
next
.next
.next
.elem)
singlelist = singlelist(head)
m = singlelist.reversesinglelist(singlelist.head)
print
("反轉後鍊錶："
)print
(m.elem)
print
(m.next
.elem)
print
(m.next
.next
.elem)
print
(m.next
.next
.next
.elem)

# 節點

class
node
(object):
def__init__
(self, elem)
: self.elem = elem
self.
next
=none
# 鍊錶
class
singlelist
(object):
def__init__
(self, head)
: self.head = head
# 判斷是否有環
defishasloop
(self, head)
: low, fast = head, head
while fast and fast.
next
: low = low.
next
fast = fast.
next
.next
if low == fast:
return
true
return
false
if __name__ ==
'__main__'
: head = node(1)
head.
next
= node(2)
head.
next
.next
= node(3)
head.
next
.next
.next
= head.
next
.next
singlelist = singlelist(head)
print
(singlelist.ishasloop(singlelist.head)
)

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