You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: _871_minimum_number_of_refueling_stops.rs
    path of file: ./repos/rustgym/leetcode/src/d8
    
    the code of the file until where you have to start completion: struct Solution;

use std::cmp::Reverse;
use std::collections::BinaryHeap;
use std::collections::HashMap;

impl Solution {
    fn min_refuel_stops(target: i32, start_fuel: i32, mut stations: Vec<Vec<i32>>) -> i32 {
        let mut queue: BinaryHeap<(Reverse<usize>, usize, i32)> = BinaryHeap::new();
        stations.push(vec![target, 0]);
        let n = stations.len();
        let fuel = start_fuel - stations[0][0];
        let mut states: HashMap<(usize, usize), i32> = HashMap::new();
        if fuel >= 0 {
            states.insert((0, 0), fuel);
            queue.push((Reverse(0), 0, fuel));
        }
        while let Some((Reverse(stop), i, fuel)) = queue.pop() {
            if i == n - 1 {
                return stop as i32;
            }
            let dist = stations[i + 1][0] - stations[i][0];
            let take = fuel + stations[i][1] - dist;
            let skip = fuel - dist;
            for &(s, f) in &[(stop + 1, take), (stop, skip)] {
                if f < 0 {
                    continue;
                }
                if let Some(&max_f) = states.get(&(i + 1, s)) {
                    if max_f >= f {
           
    
    fn min_refuel_stops(target: i32, start_fuel: i32, mut stations: Vec<Vec<i32>>) -> i32 {
        let mut queue: BinaryHeap<(Reverse<usize>, usize, i32)> = BinaryHeap::new();
        stations.push(vec![target, 0]);
        let n = stations.len();
        let fuel = start_fuel - stations[0][0];
        let mut states: HashMap<(usize, usize), i32> = HashMap::new();
        if fuel >= 0 {
            states.insert((0, 0), fuel);
            queue.push((Reverse(0), 0, fuel));
        }
        while let Some((Reverse(stop), i, fuel)) = queue.pop() {
            if i == n - 1 {
                return stop as i32;
            }
            let dist = stations[i + 1][0] - stations[i][0];
            let take = fuel + stations[i][1] - dist;
            let skip = fuel - dist;
            for &(s, f) in &[(stop + 1, take), (stop, skip)] {
                if f < 0 {
                    continue;
                }
                if let Some(&max_f) = states.get(&(i + 1, s)) {
                    if max_f >= f {
                        continue;
                    }
                }
                *states.entry((i + 1, s)).or_default() = f;
                queue.push((Reverse(s), i + 1, f));
            }
        }
        -1
    }