InterviewBit Problems   Unique Binary Search Trees : Unsolved

About the Unique Binary Search Trees : Unsolved category (1)
Please don't use dp. will cause memory limit exceeded (1)
Facing Memory Limit exceeded. How many nodes can I create within the problem limits (3)
Javascript input is broken (1)
How A can be 15 (1)
Javascript input wrong? (1)
Wrong return type and 'see expected output' doesn't work (1)
Incorrect return type. Used to be ArrayList<TreeNode> previously. Why was it changed? (1)
Return type incorrect (2)
Python return type wrong! (1)
Correct the return type for languages such as C, C++ and Java (2)
Incorrect Return Type of the method (5)
Please change the return type of method (1)
Wrong return type (1)
What is the Memory Limit? (7)
Is this problem has a smart solution? (3)
Can anyone help me understand (2)
What does it print in output while testing? (1)