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86. Partition List.py
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86. Partition List.py
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class ListNode:
def __init__(self, initdata):
self.val = initdata
self.next = None
def getData(self):
return self.val
def getNext(self):
return self.next
def setData(self, newdata):
self.val = newdata
def setNext(self, newnext):
self.next = newnext
class OrderedList:
def __init__(self):
self.head = None
def search(self, item):
current = self.head
found = False
stop = False
while current != None and not found and not stop:
if current.getData() == item:
found = True
else:
if current.getData() > item:
stop = True
else:
current = current.getNext()
return found
def add(self, li):
if isinstance(li, int):
li = [li]
for item in li:
current = self.head
previous = None
stop = False
while current != None and not stop:
if current.getData() > item:
stop = True
else:
previous = current
current = current.getNext()
temp = ListNode(item)
if previous == None:
temp.setNext(self.head)
self.head = temp
else:
temp.setNext(current)
previous.setNext(temp)
def size(self):
current = self.head
count = 0
while current != None:
count = count + 1
current = current.getNext()
return count
def tolist(self):
p = self.head
re = []
while p != None:
re.append(p.val)
p = p.next
return re
l = OrderedList()
l.add([2,1])
h = l.head
class Solution(object):
def partition(self, head, x):
"""
:type head: ListNode
:type x: int
:rtype: ListNode
"""
pre,dummy = ListNode(0),ListNode(1)
p1,p2 = pre,dummy
while head:
if head.val<x:
pre.next = head
pre,head = head,head.next
else:
dummy.next = head
dummy,head = head,head.next
# dummy.next = None
pre.next = p2.next
return p1.next
Solution().partition(h,2)
print l.tolist()