InterviewBit Problems   Delete Edge! : Unsolved

About the Delete Edge! : Unsolved category (1)
READ THIS before writing the code (10)
How to solve it in linear time (2)
Please explain the solution to me. I am unable to understand the approach (2)
Why DFS not BFS? (1)
Can one node cantain more then two subtree (4)
Whats the issue with this Fu**ing mod!😠 (2)
Wrong test case and wrong understanding of problem in the editorial (3)
Wrong problem statement mod! (2)