def oddEvenList(self, head):
l = ListNode(0)
r = ListNode(0)
l1, r1 = l, r
s = 0
while head:
s += 1
if s % 2 == 1:
l.next = head
l = head
else:
r.next = head
r = head
head = head.next
l.next = r1.next
r.next = None
return l1.next
def addAtIndex(self, index, val):
h = self.head
now = 0
while h:
if index == now:
break
h = h.next
now += 1
if h is not None:
temp = ListNode(val)
temp.next = h.next
h.next = temp
if temp.next is None:
self.tail = temp
def splitListToParts(self, root, k):
size = 0
h = root
while h:
h = h.next
size += 1
length = int(size / k)
r = [length for i in range(k)]
left = size - length * k
for i in range(left):
r[i] += 1
head = ListNode(0)
head.next = root
re = []
for i in r:
re.append(head.next)
temp = head
for j in range(i):
head = head.next
temp.next = None
return re
def reorderList(self, head):
if head is None:
return None
tmp = ListNode(0)
tmp.next = head
fast, slow = tmp, tmp
while fast and fast.next:
fast = fast.next.next
slow = slow.next
min = slow
slow = slow.next
stack = []
while slow:
stack.append(slow)
slow = slow.next
stack.reverse()
for s in stack:
s.next = head.next
head.next = s
head = s.next
head.next = None
head = tmp.next