first commit

problems/0654.最大二叉树.md

@@ -224,7 +224,31 @@ root->right = traversal(nums, maxValueIndex + 1, right);
 
 
 Java：
+```java
+class Solution {
+    public TreeNode constructMaximumBinaryTree(int[] nums) {
+        if (nums.length == 0) return null;
+        return constructMaximumBinaryTree(nums,0,nums.length);
+    }
 
+    private TreeNode constructMaximumBinaryTree(int[] nums, int begin, int end) {
+        if (begin == end) return null;
+
+        int rootValue = nums[begin];
+        int index = begin;
+        for (int i = begin; i < end ; i++) {
+            if (nums[i] > rootValue) {
+                rootValue = nums[i];
+                index = i;
+            }
+        }
+        TreeNode root = new TreeNode(rootValue);
+        root.left = constructMaximumBinaryTree(nums, begin,index);
+        root.right = constructMaximumBinaryTree(nums,index+1,end);
+        return root;
+    }
+}
+```
 
 Python：
 
@@ -238,4 +262,4 @@ Go：
 * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)
 * B站视频：[代码随想录](https://space.bilibili.com/525438321)
 * 知识星球：[代码随想录](https://mp.weixin.qq.com/s/QVF6upVMSbgvZy8lHZS3CQ)
-<div align="center"><img src=../pics/公众号.png width=450 alt=> </img></div>
+<div align="center"><img src=../pics/公众号.png width=450 alt=> </img></div>