2166. Design Bitset

A Bitset is a data structure that compactly stores bits. Implement the Bitset class: - Bitset(int size) Initializes the Bitset with size bits, all of which are 0. - void fix(int idx) Updates the value of the bit at the index idx to 1. If the value was already 1, no change occurs. - void unfix(int idx) Updates the value of the bit at the index idx to 0. If the value was already 0, no change occ