python leetcode 21. Merge Two Sorted Lists

Neekity

于 2018-12-05 15:31:13 发布

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分类专栏： leetcode python 文章标签： python leetcode

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class Solution:
    def mergeTwoLists(self, l1, l2):
        """
        :type l1: ListNode
        :type l2: ListNode
        :rtype: ListNode
        """
        if l1==None:
            return l2
        if l2 == None:
            return l1 
        result = ListNode(0)
        l=result
        while 1:
            if l1.val <= l2.val:
                l.next = l1
                l1=l1.next
                if l1==None:
                    break
            else:
                l.next=l2
                l2=l2.next
                if l2 == None:
                    break
            l=l.next
        l.next.next=l1 or l2
        
        return result.next