from linkedtools import stringToListNode, prettyPrintLinkedList
class Solution:
def removeNthFromEnd(self, head, n):
"""
:type head: ListNode
:type n: int
:rtype: ListNode
"""
length = 0
node = head
while node:
node = node.next
length += 1
target = length - n
if target == 0:
return head.next
else:
node = head
for i in range(target-1):
node = node.next
node.next = node.next.next
return head
a = stringToListNode("[1,2,3,4,5]")
prettyPrintLinkedList(Solution().removeNthFromEnd(a, 5))
len1 = 0
while c:
len1 += 1
c = c.next
c = l2
len2 = 0
while c:
len2 += 1
c = c.next
if len1 < len2:
l1, l2 = l2, l1
prettyPrintLinkedList(l1)
prettyPrintLinkedList(l2)
res = l1
while l2:
bonus, l1.val = divmod(l1.val+l2.val+bonus, 10)
last = l1
l1 = l1.next
l2 = l2.next
while bonus and l1:
bonus, l1.val = divmod(l1.val+bonus, 10)
last = l1
l1 = l1.next
if bonus:
last.next = ListNode(1)
return res
a = stringToListNode("[5]")
b = stringToListNode("[5]")
prettyPrintLinkedList(Solution().addTwoNumbers(a,b))
carry = 0
# 处理等长部分
while p1 and p2:
val = p2.val + p1.val + carry
p.next = ListNode(val % 10)
carry = val // 10
p, p1, p2 = p.next, p1.next, p2.next
# 处理不等长的部分
while p1:
val = p1.val + carry
p.next = ListNode(val % 10)
carry = val // 10
p, p1 = p.next, p1.next
while p2:
val = p2.val + carry
p.next = ListNode(val % 10)
carry = val // 10
p, p2 = p.next, p2.next
if carry > 0:
p.next = ListNode(carry)
return headnode.next
a = stringToListNode("[1,8]")
b = stringToListNode("[0]")
prettyPrintLinkedList(Solution().addTwoNumbers(a, b))
:type head: ListNode
:type m: int
:type n: int
:rtype: ListNode
"""
if head is None or head.next is None or m == n:
return head
headnode = ListNode(-1)
headnode.next = head
anchor = headnode
for _ in range(m - 1):
anchor = anchor.next
a = anchor.next
b = a.next
c = b.next
k = n - m
for _ in range(k):
b.next = a
if c:
a, b, c = b, c, c.next
else:
a, b = b, c
anchor.next.next = b
anchor.next = a
return headnode.next
a = stringToListNode("[1,2,3]")
prettyPrintLinkedList(Solution().reverseBetween(a, 2, 3))
from linkedtools import ListNode, prettyPrintLinkedList, stringToListNode
class Solution:
def oddEvenList(self, head):
"""
:type head: ListNode
:rtype: ListNode
"""
if head is None or head.next is None:
return head
head1 = head
head2 = head.next
c1 = head1
c2 = head2
while c2 and c2.next:
c1.next = c2.next
c1 = c1.next
c2.next = c1.next
c2 = c2.next
c1.next = head2
return head1
a = stringToListNode("[]")
prettyPrintLinkedList(Solution().oddEvenList(a))
class Solution:
def deleteDuplicates(self, head):
"""
:type head: ListNode
:rtype: ListNode
"""
headnode = ListNode(None)
headnode.next = head
delete = False
p = headnode # prev
c = head # current
while c:
while c.next and c.val == c.next.val:
c.next = c.next.next
if not delete:
delete = True
if delete:
c = c.next
p.next = c
delete = False
else:
c = c.next
p = p.next
return headnode.next
a = stringToListNode("[1,1,1,2,2,4]")
prettyPrintLinkedList(Solution().deleteDuplicates(a))
"""
if head is None or head.next is None:
return head
sorted = head
unsorted = head.next
inf = ListNode(float("inf"))
sorted.next = inf
# sorted.next.next = sorted
while unsorted:
c = sorted
while c.val < unsorted.val:
c = c.next
temp = unsorted
unsorted = unsorted.next
temp.next = c.next
c.next = temp
c.val, temp.val = temp.val, c.val
while True:
if c.next.val == float("inf"):
break
c = c.next
c.next = None
return sorted
a = stringToListNode("[6,5,3,1,8,7,2,4]")
# a = stringToListNode("[1,6]")
prettyPrintLinkedList(Solution().insertionSortList(a))