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Update 0236.二叉树的最近公共祖先.md

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0236.二叉树的最近公共祖先   java版本中有一个变量没用，删除该变量
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problems/0236.二叉树的最近公共祖先.md
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@ -249,7 +249,6 @@ class Solution {
```java
// 代码精简版
class Solution {
TreeNode pre;
public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) {
if (root == null || root.val == p.val ||root.val == q.val) return root;
TreeNode left = lowestCommonAncestor(root.left,p,q);