Python solution

  • 0
    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: = l1  
    			l1 =  
    		else: = l2  
    			l2 =  
    		cur = = l1 or l2  

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