# Exercise 11.1.2

A bit vector is simply an array of bits (0s and 1s). A bit vector of length $m$ takes much less space than an array of $m$ pointers. Describe how to use a bit vector to represent a dynamic set of distinct elements with no satellite data. Dictionary operations should run in $\O(1)$ time.

The elements have to be numbers.

Each bit in the bit vector represents whether an element is present (1) or not present (0) in the dynamic set. This is sufficient when we're not storing satellite data. We need to use some binary operations (&, |) in order to modify the bit vector or query it.

The operations are pretty straightforward. The only tricky part is the bit vector size. If a dynamic set is to store the element 1000, then the vector needs to be at least 1000 bits.