Merge pull request #4 from AyushRaj1111/fix/flatten-binary-tree-order

Fix line order in flatten binary tree function

Author: Codensity30

11. Binary Trees/3. Hard/13. Flatten Binary Tree.cpp

@@ -34,8 +34,8 @@ void flatten(TreeNode* root) {
                 temp = temp->right;
 
             temp->right = curr->right;
-            curr->left = NULL;
             curr->right = curr->left;
+            curr->left = NULL;
         }
         curr = curr->right;
     }