The problem statement contains the unicode symbols.
You are developing a new software calculator. A very important
feature is the auto-placing of the ? value by one click. The only problem is that you don't know
the required precision. That's why you decided to write a program that can return ?
with any reasonable precision.
You are given an int precision. You should return the ? value with
exactly precision digits after the decimal point. The last digit(s) should be rounded according
to the standard rounding rules (less than five round down, more than or equal to five round up).