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Update 剑指 offer 题解.md

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这里的ArrayList应该设为Solution的类属性，因为如果像原来那样将它放到方法里，那么每次递归调用该方法的时候都会新建一个ArrayList。
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@ -251,8 +251,9 @@ public ArrayList<Integer> printListFromTailToHead(ListNode listNode) {
### 使用递归
```java
ArrayList<Integer> ret = new ArrayList<>();
public ArrayList<Integer> printListFromTailToHead(ListNode listNode) {
ArrayList<Integer> ret = new ArrayList<>();
// ArrayList<Integer> ret = new ArrayList<>();
if (listNode != null) {
ret.addAll(printListFromTailToHead(listNode.next));
ret.add(listNode.val);