From 2f1e4e18c98063eee3059992e16f55de37723f20 Mon Sep 17 00:00:00 2001
From: huangge1199 <huangge1199@hotmail.com>
Date: Thu, 15 Jul 2021 13:10:03 +0800
Subject: [PATCH] =?UTF-8?q?617:=E5=90=88=E5=B9=B6=E4=BA=8C=E5=8F=89?=
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---
 .../editor/cn/MergeTwoBinaryTrees.java        | 76 +++++++++++++++++++
 .../leetcode/editor/cn/MergeTwoBinaryTrees.md | 25 ++++++
 2 files changed, 101 insertions(+)
 create mode 100644 src/main/java/leetcode/editor/cn/MergeTwoBinaryTrees.java
 create mode 100644 src/main/java/leetcode/editor/cn/MergeTwoBinaryTrees.md

diff --git a/src/main/java/leetcode/editor/cn/MergeTwoBinaryTrees.java b/src/main/java/leetcode/editor/cn/MergeTwoBinaryTrees.java
new file mode 100644
index 0000000..39f7d0d
--- /dev/null
+++ b/src/main/java/leetcode/editor/cn/MergeTwoBinaryTrees.java
@@ -0,0 +1,76 @@
+//给定两个二叉树，想象当你将它们中的一个覆盖到另一个上时，两个二叉树的一些节点便会重叠。 
+//
+// 你需要将他们合并为一个新的二叉树。合并的规则是如果两个节点重叠，那么将他们的值相加作为节点合并后的新值，否则不为 NULL 的节点将直接作为新二叉树的节点
+//。 
+//
+// 示例 1: 
+//
+// 
+//输入: 
+//	Tree 1                     Tree 2                  
+//          1                         2                             
+//         / \                       / \                            
+//        3   2                     1   3                        
+//       /                           \   \                      
+//      5                             4   7                  
+//输出: 
+//合并后的树:
+//	     3
+//	    / \
+//	   4   5
+//	  / \   \ 
+//	 5   4   7
+// 
+//
+// 注意: 合并必须从两个树的根节点开始。 
+// Related Topics 树 深度优先搜索 广度优先搜索 二叉树 
+// 👍 724 👎 0
+
+package leetcode.editor.cn;
+
+import com.code.leet.entiy.TreeNode;
+
+//617:合并二叉树
+public class MergeTwoBinaryTrees {
+    public static void main(String[] args) {
+        //测试代码
+        Solution solution = new MergeTwoBinaryTrees().new Solution();
+    }
+    //力扣代码
+    //leetcode submit region begin(Prohibit modification and deletion)
+
+    /**
+     * Definition for a binary tree node.
+     * public class TreeNode {
+     * int val;
+     * TreeNode left;
+     * TreeNode right;
+     * TreeNode() {}
+     * TreeNode(int val) { this.val = val; }
+     * TreeNode(int val, TreeNode left, TreeNode right) {
+     * this.val = val;
+     * this.left = left;
+     * this.right = right;
+     * }
+     * }
+     */
+    class Solution {
+        public TreeNode mergeTrees(TreeNode root1, TreeNode root2) {
+            TreeNode head;
+            if (root1 != null && root2 != null) {
+                head = new TreeNode(root1.val + root2.val);
+                head.left = mergeTrees(root1.left, root2.left);
+                head.right = mergeTrees(root1.right, root2.right);
+            } else if (root1 == null && root2 == null) {
+                head = null;
+            } else if (root1 == null) {
+                head = root2;
+            } else {
+                head = root1;
+            }
+            return head;
+        }
+    }
+//leetcode submit region end(Prohibit modification and deletion)
+
+}
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diff --git a/src/main/java/leetcode/editor/cn/MergeTwoBinaryTrees.md b/src/main/java/leetcode/editor/cn/MergeTwoBinaryTrees.md
new file mode 100644
index 0000000..dc2d967
--- /dev/null
+++ b/src/main/java/leetcode/editor/cn/MergeTwoBinaryTrees.md
@@ -0,0 +1,25 @@
+<p>给定两个二叉树，想象当你将它们中的一个覆盖到另一个上时，两个二叉树的一些节点便会重叠。</p>
+
+<p>你需要将他们合并为一个新的二叉树。合并的规则是如果两个节点重叠，那么将他们的值相加作为节点合并后的新值，否则<strong>不为&nbsp;</strong>NULL 的节点将直接作为新二叉树的节点。</p>
+
+<p><strong>示例&nbsp;1:</strong></p>
+
+<pre>
+<strong>输入:</strong> 
+	Tree 1                     Tree 2                  
+          1                         2                             
+         / \                       / \                            
+        3   2                     1   3                        
+       /                           \   \                      
+      5                             4   7                  
+<strong>输出:</strong> 
+合并后的树:
+	     3
+	    / \
+	   4   5
+	  / \   \ 
+	 5   4   7
+</pre>
+
+<p><strong>注意:</strong>&nbsp;合并必须从两个树的根节点开始。</p>
+<div><div>Related Topics</div><div><li>树</li><li>深度优先搜索</li><li>广度优先搜索</li><li>二叉树</li></div></div>\n<div><li>👍 724</li><li>👎 0</li></div>
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