B. New Year's Number Polycarp remembered the 20202020-th year, and he is happy with the arrival of the new 20212021-th year. To remember such a wonderful moment, Polycarp wants to represent …
A. Odd Divisor You are given an integer nn. Check if nn has an odd divisor, greater than one (does there exist such a number xx (x>1x>1) that nn is d…