Leetcode problem same as in this video

the problem is :


my solution for this is :

can you please check and explain me what the error that is coming here is?
i have serialised the tree in preorder fashion and put a # wherever there is a NULL. my serialise function is running fine, there is a problem with deseialise which is the same as the buildtree in this video. plz check the problem

Hi @alankrit.agr99
try refering to dis code for help

can you tell me why my code is showing TLE i have just used a normal DFS in preorder then why TLE?
can you please explain me about its time complexity as well

if you see my code i have done the same thing that you have done, i have just used a vector instead of a queue then why is my code giving a TLE?