Почему выскакивает ошибка?

Question

Компилятор ругается на NULL
https://code.sololearn.com/cs2iGC9Z3e5n/?ref=app

Answer 1

instruction in line 32 is redundant.
beside that it is not safe to directly assign NULL to an int ( int c++ >= 11) ( The standard does not define the behavior of your assignment on such an implementation, so its behavior is undefined ).

also line 34:
newArr[i - 1] = arr[i] // index out of bounds, also UB

change it to :
newArr[i] = arr[i+1];