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; } } }