程序在Python中按大小为k的组反向链接列表
假设我们有一个单链表,还有另一个值k,我们必须反转每k个连续的节点组。
因此,如果输入类似于List = [1,2,3,4,5,6,7,8,9,10],k = 3,则输出将为[3,2,1,1,6,5 ,4,9,8,7,10,]
为了解决这个问题,我们将遵循以下步骤-
tmp:=一个值为0的新节点
tmp的下一个:=节点
上一页:= null,curr:= null
lp:= temp,lc:= curr
cnt:= k
虽然curr不为空,但是
以下:=下一个
下一个curr:=上一页
上一页:= curr,curr:=以下
cnt:= cnt-1
上一页:=空
当cnt> 0并且curr不为null时,执行
下一个lp:=上一个,下一个lc:= curr
lp:= lc,lc:= curr
cnt:= k
返回tmp的下一个
让我们看下面的实现以更好地理解-
示例
class ListNode:def __init__(self, data, next = None):
self.val = data
self.next = next
def make_list(elements):
head = ListNode(elements[0])
for element in elements[1:]:
ptr = head
while ptr.next:
ptr = ptr.next
ptr.next = ListNode(element)
return head
def print_list(head):
ptr = head print('[', end = "")
while ptr:
print(ptr.val, end = ", ")
ptr = ptr.next
print(']')
class Solution:
def solve(self, node, k):
tmp = ListNode(0)
tmp.next = node
prev, curr = None, node
lp, lc = tmp, curr
cnt = k
while curr:
prev = None
while cnt > 0 and curr:
following = curr.next
curr.next = prev
prev, curr = curr, following
cnt -= 1
lp.next, lc.next = prev, curr
lp, lc = lc, curr
cnt = k
return tmp.next
ob = Solution()head = make_list([1,2,3,4,5,6,7,8,9,10])
print_list(ob.solve(head, 3))
输入值
[1,2,3,4,5,6,7,8,9,10], 3
输出结果
[3, 2, 1, 6, 5, 4, 9, 8, 7, 10, ]
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