diff --git a/udemyproblems/src/main/java/MaxBinary.java b/udemyproblems/src/main/java/MaxBinary.java
new file mode 100644
index 0000000..42c82da
--- /dev/null
+++ b/udemyproblems/src/main/java/MaxBinary.java
@@ -0,0 +1,22 @@
+public class MaxBinary {
+    public TreeNode constructMaximumBinaryTree(int[] nums) {
+        return construct(nums, 0, nums.length);
+    }
+    public TreeNode construct(int[] nums, int l, int r) {
+        if (l == r)
+            return null;
+        int max_i = max(nums, l, r);
+        TreeNode root = new TreeNode(nums[max_i]);
+        root.left = construct(nums, l, max_i);
+        root.right = construct(nums, max_i + 1, r);
+        return root;
+    }
+    public int max(int[] nums, int l, int r) {
+        int max_i = l;
+        for (int i = l; i < r; i++) {
+            if (nums[max_i] < nums[i])
+                max_i = i;
+        }
+        return max_i;
+    }
+}