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merge_two_sorted_lists.py

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# -*- coding: utf-8 -*-

class Solution:

"""

@param two ListNodes

@return a ListNode

"""

def mergeTwoLists(self, l1, l2):

# write your code here

head, tail = None, None

while l1 and l2:

if l1.val < l2.val:

node = ListNode(l1.val)

l1 = l1.next

else:

node = ListNode(l2.val)

l2 = l2.next

if not head:

head = node

else:

tail.next = node

tail = node

node = l1 if l1 else l2

if not head:

head = node

else:

tail.next = node

tail = node

return head