use std::collections::{HashMap, HashSet};

#[derive(Default)]
pub struct NFA {
    state_count: usize,
    transition_table: HashMap<Option<char>, HashSet<usize>>,
}

impl NFA {
    pub fn new_state(&mut self) -> usize {
        let result = self.state_count;
        self.state_count += 1;
        result
    }
}