Please, I need help debugging.

Question

https://code.sololearn.com/cJJ8V2KOB3qk/?ref=app

Answer 1

Emediong “Taki” Inyangetuk

No need of 2 scanner object
1 scanner object is enough to take values.

Answer 2

The error happens because you try to read from a empty stream (for get N2).
Internally the Scanner class fill an internal buffer at any read (next call) then when you init f Scanner System.in is yet readed from sc Scanner then f will raise an exception because it cannot read from the in.
You can solve by using one Scanner only or read from only one of them