【leetcode❤python】21. Merge Two Sorted Lists

#-*- coding: UTF-8 -*-
# Definition for singly-linked list.
# class ListNode(object):
#     def __init__(self, x):
#         self.val = x
#         self.next = None
#Method1
class Solution(object):
    def mergeTwoLists(self, l1, l2):
        """
        :type l1: ListNode
        :type l2: ListNode
        :rtype: ListNode
        """
        if l1==None:return l2
        if l2==None:return l1

        node=None

        while l1!=None and l2!=None:

            if l1.val<=l2.val:
                if node==None:
                    node=l1
                    head=node
                else:
                    node.next=l1
                    node=node.next
                l1=l1.next
            else:

                if node==None:
                    node=l2
                    head=node
                else:
                    node.next=l2
                    node=node.next
                l2=l2.next

        node.next=l1 or l2
        return head


#Method2
class Solution:
    def mergeTwoLists(self, l1, l2):
        if not l1 and not l2:
            return None

        dummy = ListNode(0)
        cur = dummy
        while l1 and l2:
            if l1.val <= l2.val:
                cur.next = l1
                l1 = l1.next
            else:
                cur.next = l2
                l2 = l2.next
            cur = cur.next
        cur.next = l1 or l2

        return dummy.next

巴特西

【leetcode❤python】21. Merge Two Sorted Lists

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