Python学习——leetcode(Merge Two Sorted Lists )

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class Solution:    # @param two ListNodes    # @return a ListNode    def mergeTwoLists(self, l1, l2):pre=l1now1=l1now2=l2#pdb.set_trace()if l1:if l2:while now1!=None and now2!=None:if now1.val<=now2.val:pre=now1now1=now1.nextelse:if pre==now1:next=now2.nextnow2.next=prepre=now2l1=now2now2=nextelse:next=now2.nextpre.next=now2now2.next=now1pre=now2now2=nextif now2!=None:pre.next=now2pre=now2now2=now2.nextreturn l1else:return l1else:if l2:return l2else:return None

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