From 8b9b64d7d576a783a3bb8fecdc3d614a4f9a6f36 Mon Sep 17 00:00:00 2001
From: AronJudge <2286381138@qq.com>
Date: Sat, 16 Jul 2022 15:43:50 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E6=94=B9:=200617=20=E5=90=88=E5=B9=B6?=
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修改代码细节，优化性能.

用原有的Root1 代替 创建的NewRoot.
---
 problems/0617.合并二叉树.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/problems/0617.合并二叉树.md b/problems/0617.合并二叉树.md
index acdcc0aa..6a843763 100644
--- a/problems/0617.合并二叉树.md
+++ b/problems/0617.合并二叉树.md
@@ -262,10 +262,10 @@ class Solution {
         if (root1 == null) return root2;
         if (root2 == null) return root1;
 
-        TreeNode newRoot = new TreeNode(root1.val + root2.val);
-        newRoot.left = mergeTrees(root1.left,root2.left);
-        newRoot.right = mergeTrees(root1.right,root2.right);
-        return newRoot;
+        root1.val += root2.val;
+        root1.left = mergeTrees(root1.left,root2.left);
+        root1.right = mergeTrees(root1.right,root2.right);
+        return root1;
     }
 }
 ```