题解 | #数组中重复的数字#
从尾到头打印链表
http://www.nowcoder.com/practice/d0267f7f55b3412ba93bd35cfa8e8035
递归，dfs
* public class ListNode {
* int val;
* ListNode next = null;
*
* ListNode(int val) {
* this.val = val;
* }
* }
*
*/
import java.util.ArrayList;
public class Solution {
public void dfs(ArrayList<Integer>ans,ListNode listnode){
if(listnode==null) return ;
dfs(ans,listnode.next);
ans.add(listnode.val);
}
public ArrayList<Integer> printListFromTailToHead(ListNode listNode) {
ArrayList<Integer>ans=new ArrayList<>();
dfs(ans,listNode);
return ans;
}
}
