diff --git a/BST to greater sum tree b/BST to greater sum tree
new file mode 100644
index 0000000..a70c394
--- /dev/null
+++ b/BST to greater sum tree	
@@ -0,0 +1,12 @@
+class Solution {
+    int cs = 0;
+  public:
+    void transformTree(Node *root) {
+        if(!root)return;
+        int d = root->data;
+        transformTree(root->right);
+        root->data = cs;
+        cs += d;
+        transformTree(root->left);
+    }
+};