InterviewBit Problems   Flatten Binary Tree to Linked List : Unsolved

About the Flatten Binary Tree to Linked List : Unsolved category (1)
Don't waste your time, It's just simple pre-order Traversal (1)
How do I give input for a tree in expected output column? (2)
Using Morris threading iteratively (1)
Very easy Solution in C++ (1)
Easy Solution in C++( very Easy) (1)
What is this : [LEFT FOUND!]? (4)
Question Explained (1)
What is wrong in my input? (2)
Easy to grasp C++ soln (inplace) (1)
What is the order in which we should flatten the binary tree? (3)
Is the given solution wrong? (1)
The Solution is giving me a runtime error! (2)
[CPP] MLE?please delete the left nodes before submitting ans (or older tree if you are making new tree) (1)
Why python recursive giving maximum recursive limit error on submission (5)
Python correct algo, but somewhere syntax problem (1)
Memory Limit Exceed issue (6)
Recursive soln in java without stacks (1)
I am not able to find why i'm getting tle in my code (1)
Recursive Solution below (1)
[LEFT FOUND!] is being printed at the end (4)
String being appended to the output (2)
Can someone explain the time complexity (1)
It kept saying Memory Limit Exceded.Haven't used any extra space (1)
Explanation of in-place (3)
Same Code gives MLE in C++ but runs smoothly in C! How? (1)
Constant space solution resulting in MLE (1)
Getting TLE for Non-recursive solution (1)
No Extra Memory used . Still it's say "not most optimal solution" (1)
Why does this give TLE? (1)