From c159731fa397c66a54c58a29a76206ce37fd63c1 Mon Sep 17 00:00:00 2001
From: huangge1199 <huangge1199@hotmail.com>
Date: Mon, 7 Jun 2021 10:28:06 +0800
Subject: [PATCH] =?UTF-8?q?109:=E6=9C=89=E5=BA=8F=E9=93=BE=E8=A1=A8?=
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---
 .../ConvertSortedListToBinarySearchTree.java  | 84 +++++++++++++++++++
 .../cn/ConvertSortedListToBinarySearchTree.md | 17 ++++
 2 files changed, 101 insertions(+)
 create mode 100644 src/main/java/leetcode/editor/cn/ConvertSortedListToBinarySearchTree.java
 create mode 100644 src/main/java/leetcode/editor/cn/ConvertSortedListToBinarySearchTree.md

diff --git a/src/main/java/leetcode/editor/cn/ConvertSortedListToBinarySearchTree.java b/src/main/java/leetcode/editor/cn/ConvertSortedListToBinarySearchTree.java
new file mode 100644
index 0000000..25cf787
--- /dev/null
+++ b/src/main/java/leetcode/editor/cn/ConvertSortedListToBinarySearchTree.java
@@ -0,0 +1,84 @@
+//给定一个单链表，其中的元素按升序排序，将其转换为高度平衡的二叉搜索树。 
+//
+// 本题中，一个高度平衡二叉树是指一个二叉树每个节点 的左右两个子树的高度差的绝对值不超过 1。 
+//
+// 示例: 
+//
+// 给定的有序链表： [-10, -3, 0, 5, 9],
+//
+//一个可能的答案是：[0, -3, 9, -10, null, 5], 它可以表示下面这个高度平衡二叉搜索树：
+//
+//      0
+//     / \
+//   -3   9
+//   /   /
+// -10  5
+// 
+// Related Topics 深度优先搜索 链表 
+// 👍 533 👎 0
+
+package leetcode.editor.cn;
+
+import com.code.leet.entiy.ListNode;
+import com.code.leet.entiy.TreeNode;
+
+//109:有序链表转换二叉搜索树
+public class ConvertSortedListToBinarySearchTree {
+    public static void main(String[] args) {
+        //测试代码
+        Solution solution = new ConvertSortedListToBinarySearchTree().new Solution();
+    }
+    //力扣代码
+    //leetcode submit region begin(Prohibit modification and deletion)
+/**
+ * Definition for singly-linked list.
+ * public class ListNode {
+ *     int val;
+ *     ListNode next;
+ *     ListNode() {}
+ *     ListNode(int val) { this.val = val; }
+ *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
+ * }
+ */
+    /**
+     * 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 sortedListToBST(ListNode head) {
+            if (head == null) {
+                return null;
+            } else if (head.next == null) {
+                return new TreeNode(head.val);
+            }
+            ListNode beforeMid = head;
+            ListNode mid = head;
+            ListNode last = head;
+            while (last != null && last.next != null) {
+                beforeMid = mid;
+                mid = mid.next;
+                last = last.next.next;
+            }
+
+            beforeMid.next = null;
+            TreeNode root = new TreeNode(mid.val);
+            root.left = sortedListToBST(head);
+            root.right = sortedListToBST(mid.next);
+
+            return root;
+        }
+    }
+//leetcode submit region end(Prohibit modification and deletion)
+
+}
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diff --git a/src/main/java/leetcode/editor/cn/ConvertSortedListToBinarySearchTree.md b/src/main/java/leetcode/editor/cn/ConvertSortedListToBinarySearchTree.md
new file mode 100644
index 0000000..34af21a
--- /dev/null
+++ b/src/main/java/leetcode/editor/cn/ConvertSortedListToBinarySearchTree.md
@@ -0,0 +1,17 @@
+<p>给定一个单链表，其中的元素按升序排序，将其转换为高度平衡的二叉搜索树。</p>
+
+<p>本题中，一个高度平衡二叉树是指一个二叉树<em>每个节点&nbsp;</em>的左右两个子树的高度差的绝对值不超过 1。</p>
+
+<p><strong>示例:</strong></p>
+
+<pre>给定的有序链表： [-10, -3, 0, 5, 9],
+
+一个可能的答案是：[0, -3, 9, -10, null, 5], 它可以表示下面这个高度平衡二叉搜索树：
+
+      0
+     / \
+   -3   9
+   /   /
+ -10  5
+</pre>
+<div><div>Related Topics</div><div><li>深度优先搜索</li><li>链表</li></div></div>\n<div><li>👍 533</li><li>👎 0</li></div>
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