diff --git a/10 October LeetCode Challenge 2021/13_bstFromPreOrder.cpp b/10 October LeetCode Challenge 2021/13_bstFromPreOrder.cpp
new file mode 100644
index 0000000..5fc7284
--- /dev/null
+++ b/10 October LeetCode Challenge 2021/13_bstFromPreOrder.cpp	
@@ -0,0 +1,26 @@
+/**
+ * Definition for a binary tree node.
+ * struct TreeNode {
+ *     int val;
+ *     TreeNode *left;
+ *     TreeNode *right;
+ *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
+ * };
+ */
+class Solution {
+public:
+    TreeNode* bstFromPreorder(vector<int>& preorder, int max_val = INT_MAX) {
+        if (i == preorder.size() || preorder[i] > max_val) return NULL;
+        
+        TreeNode* root = new TreeNode(preorder[i++]);
+        
+        root->left = bstFromPreorder(preorder, root->val);
+        root->right = bstFromPreorder(preorder, max_val);
+        
+        return root;        
+    }
+private:
+    int i = 0;
+};