題目:
輸入乙個複雜鍊錶(每個節點中有節點值,以及兩個指標,乙個指向下乙個節點,另乙個特殊指標指向任意乙個節點),返回結果為複製後複雜鍊錶的head。(注意,輸出結果中請不要返回引數中的節點引用,否則判題程式會直接返回空)
思路一:
雜湊表**:
# class randomlistnode:
# def __init__(self, x):
# self.label = x
# self.next = none
# self.random = none
class
solution
:# 返回 randomlistnode
defclone
(self, phead):if
not phead:
return
none
clonehead = randomlistnode(phead.label)
node = clonehead
randomlist =
randomlist[phead]
= node
while phead.
next
: phead = phead.
next
node.
next
= randomlistnode(phead.label)
node = node.
next
randomlist[phead]
= node
for i in randomlist:
if i.random:
randomlist[i]
.random = randomlist[i.random]
return clonehead
思路二:
複製每個節點後將複製節點放在原節點後,最後再拆分
**:
# class randomlistnode:
# def __init__(self, x):
# self.label = x
# self.next = none
# self.random = none
class
solution
:# 返回 randomlistnode
defclone
(self, phead):if
not phead:
return
none
p = phead
while p:
node = randomlistnode(p.label)
node.
next
= p.
next
p.next
= node
p = node.
next
p = phead
while p:
if p.random:
p.next
.random = p.random.
next
p = p.
next
.next
clonehead = phead.
next
node = phead
while node.
next
: temp = node.
next
node.
next
= node.
next
.next
node = temp
return clonehead
思路三:
不要臉寫法
**:
# class randomlistnode:
# def __init__(self, x):
# self.label = x
# self.next = none
# self.random = none
import copy
class
solution
:# 返回 randomlistnode
defclone
(self, phead)
: clonehead = copy.deepcopy(phead)
return clonehead
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