题目链接
0ms
class Solution {
public ListNode mergeTwoLists(ListNode list1, ListNode list2) {
//如果某个list为空就直接返回零一list
if(list1==null) return list2;
if(list2==null) return list1;
if(list1.val<=list2.val){
list1.next = mergeTwoLists(list1.next,list2);
return list1;
}else{
list2.next = mergeTwoLists(list1,list2.next);
return list2;
}
}
}