pub mod first;
/// A Minimum Stack data structure.
/// A minimum stack has O(1) appends and O(1) pops.
/// As well, the Minimum stack returns the minimum element in the stack in O(1) time.
pub mod min_stack;
pub mod money;
/// A queue implemented with two stacks.
pub mod queue_with_stack;
pub mod second;
pub mod stack_with_queue;