# 把二叉搜索树转换为累加树

<p><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">给定一个二叉搜索树，请将它的每个</font></span></span></span></span>节点<span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">的值替换成树中大于或者等于该</font></span></span></span></span>节点<span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">值的所有</font></span></span></span></span>节点<span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">值之和。</font></span></span></span></span></p>

<p>提醒一下，二叉搜索树满足下列约束条件：</p>

<ul>
	<li>节点的左子树仅包含键<strong> 小于 </strong>节点键的节点。</li>
	<li>节点的右子树仅包含键<strong> 大于</strong> 节点键的节点。</li>
	<li>左右子树也必须是二叉搜索树。</li>
</ul>

<p><strong>注意：</strong>该题目与 538: <a href="https://leetcode-cn.com/problems/convert-bst-to-greater-tree/">https://leetcode-cn.com/problems/convert-bst-to-greater-tree/  </a>相同</p>

<p> </p>

<p><strong>示例 1：</strong></p>

<p><strong><img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/05/03/tree.png" style="height: 364px; width: 534px;" /></strong></p>

<pre>
<strong>输入：</strong>[4,1,6,0,2,5,7,null,null,null,3,null,null,null,8]
<strong>输出：</strong>[30,36,21,36,35,26,15,null,null,null,33,null,null,null,8]
</pre>

<p><strong>示例 2：</strong></p>

<pre>
<strong>输入：</strong>root = [0,null,1]
<strong>输出：</strong>[1,null,1]
</pre>

<p><strong>示例 3：</strong></p>

<pre>
<strong>输入：</strong>root = [1,0,2]
<strong>输出：</strong>[3,3,2]
</pre>

<p><strong>示例 4：</strong></p>

<pre>
<strong>输入：</strong>root = [3,2,4,1]
<strong>输出：</strong>[7,9,4,10]
</pre>

<p> </p>

<p><strong>提示：</strong></p>

<ul>
	<li>树中的节点数介于 <code>1</code> 和 <code>100</code> 之间。</li>
	<li>每个节点的值介于 <code>0</code> 和 <code>100</code> 之间。</li>
	<li>树中的所有值 <strong>互不相同</strong> 。</li>
	<li>给定的树为二叉搜索树。</li>
</ul>


## template

```cpp


```

## 答案

```cpp

```

## 选项

### A

```cpp

```

### B

```cpp

```

### C

```cpp

```