update: 添加问题“669. 修剪二叉搜索树”的Java版代码 (#1186)

* 添加669. 修剪二叉搜索树的Java版代码

* refactor: format Java code

* docs: acknowledgement (#1186)

* docs: typo

---------

Co-authored-by: LetMeFly666 <[email protected]>

Author: laughWinter

Codes/0669-trim-a-binary-search-tree.java

@@ -0,0 +1,58 @@
+/*
+ * @Author: laughWinter
+ * @Date: 2025-10-26 23:16:50
+ * @LastEditors: LetMeFly.xyz
+ * @LastEditTime: 2025-10-27 09:42:30
+ */
+// import javax.swing.tree.TreeNode;
+
+/**
+ * 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 trimBST(TreeNode root, int low, int high) {
+        //寻找新的根节点
+        while ((root != null) && ((root.val < low) || (root.val > high))) {
+            if (root.val < low) {
+                root = root.right;
+            } else if (root.val > high) {
+                root = root.left;
+            }
+        }
+        if (root == null) {
+            return null;
+        }
+        //修建root的左右子树
+        TreeNode tmp = root;
+        while (tmp.left != null) {
+            if (tmp.left.val < low) {
+                tmp.left = tmp.left.right;
+            } else {
+                tmp = tmp.left;
+            }
+        }
+        tmp = root;
+        while (tmp.right != null) {
+            if (tmp.right.val > high) {
+                tmp.right = tmp.right.left;
+            } else {
+                tmp = tmp.right;
+            }
+        }
+
+        return root;
+    }
+}

README.md

@@ -2,7 +2,7 @@
  * @Author: LetMeFly
  * @Date: 2022-05-19 18:48:53
  * @LastEditors: LetMeFly.xyz
- * @LastEditTime: 2025-09-27 13:24:44
+ * @LastEditTime: 2025-10-27 10:03:05
 -->
 # LetLeet Blog
 
@@ -33,6 +33,12 @@
 
 在线博客：[blog.letmefly.xyz](https://blog.letmefly.xyz/)
 
+真诚感谢本仓库的贡献者！
+
+|贡献者|贡献内容|
+|:--:|:--:|
+|[laughWinter](https://github.com/laughWinter)|添加LeetCode669.Java版本的代码[#1186](https://github.com/LetMeFly666/LeetCode/pull/1186)|
+
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