python写算法题:leetcode: 21. Merge Two Sorted Lists
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https://leetcode.com/problems/merge-two-sorted-lists/#/description
# Definition for singly-linked list.# class ListNode(object):# def __init__(self, x):# self.val = x# self.next = Noneclass 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 head=None if l1.val<l2.val: head=l1 l1=l1.next else: head=l2 l2=l2.next mlist=head while l1!=None and l2!=None: if l1.val<l2.val: mlist.next=l1 l1=l1.next else: mlist.next=l2 l2=l2.next mlist=mlist.next if l1==None: mlist.next=l2 else: mlist.next=l1 return head
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