Rusty Rob Codejam 2022 1B

controlled_inflation.rs

// video here: https://www.youtube.com/c/RobertKing/videos

fn dist(x: u64, y: u64) -> u64 {
    if x <= y {
        return y - x;
    }
    x-y
}

fn min(x: u64, y: u64) -> u64 {
    if x < y {
        return x;
    }
    y
}

fn main() {
    let (r, w) = (std::io::stdin(), std::io::stdout());
    let mut sc = IO::new(r.lock(), w.lock());

    let t: usize = sc.read();
    for case_num in 1..=t {
        let n: usize = sc.read();
        let p: usize = sc.read();
        let mut v = vec![];
        for _ in 0..n {
            let mut xs: Vec<u64> = sc.vec(p);
            xs.sort_unstable();
            v.push((xs[0], xs[p-1]));
        }
        v.reverse();
        v.push((0, 0));
        let mut dp = vec![[0, 0]; n+1];
        for i in (0..n).rev() {
            //  + dist(v[i].0, v[i].1)
            let ll = dist(v[i].0, v[i+1].0) + dp[i+1][0];
            let rl = dist(v[i].0, v[i+1].1) + dp[i+1][1];
            let lr = dist(v[i].1, v[i+1].0) + dp[i+1][0];
            let rr = dist(v[i].1, v[i+1].1) + dp[i+1][1];
            dp[i][1] = min(ll,rl) + dist(v[i].0, v[i].1);
            dp[i][0] = min(lr, rr) + dist(v[i].0, v[i].1);
        }
        let ans = min(dp[0][0], dp[0][1]);
        sc.write(
            format!("Case #{}: {}", case_num, ans)
        );
        sc.write("\n");
    }
}

pub struct IO<R, W: std::io::Write>(R, std::io::BufWriter<W>);

impl<R: std::io::Read, W: std::io::Write> IO<R, W> {
    pub fn new(r: R, w: W) -> IO<R, W> {
        IO(r, std::io::BufWriter::new(w))
    }
    pub fn write<S: ToString>(&mut self, s: S) {
        use std::io::Write;
        self.1.write_all(s.to_string().as_bytes()).unwrap();
    }
    pub fn read<T: std::str::FromStr>(&mut self) -> T {
        use std::io::Read;
        let buf = self
            .0
            .by_ref()
            .bytes()
            .map(|b| b.unwrap())
            .skip_while(|&b| b == b' ' || b == b'\n' || b == b'\r' || b == b'\t')
            .take_while(|&b| b != b' ' && b != b'\n' && b != b'\r' && b != b'\t')
            .collect::<Vec<_>>();
        unsafe { std::str::from_utf8_unchecked(&buf) }
            .parse()
            .ok()
            .expect("Parse error.")
    }
    pub fn usize0(&mut self) -> usize {
        self.read::<usize>() - 1
    }
    pub fn vec<T: std::str::FromStr>(&mut self, n: usize) -> Vec<T> {
        (0..n).map(|_| self.read()).collect()
    }
    pub fn chars(&mut self) -> Vec<char> {
        self.read::<String>().chars().collect()
    }

    pub fn binary_vec(&mut self) -> Vec<u8> {
        self.read::<String>()
            .bytes()
            .map(|b| b - b'0')
            .collect()
    }
}

pancake_deque.rs

// video here: https://www.youtube.com/c/RobertKing/videos

use std::collections::VecDeque;

fn main() {
    let (r, w) = (std::io::stdin(), std::io::stdout());
    let mut sc = IO::new(r.lock(), w.lock());

    let t: usize = sc.read();
    for case_num in 1..=t {
        let n: usize = sc.read();
        let v: Vec<usize> = sc.vec(n);
        let mut q: VecDeque<usize> = VecDeque::from(v);
        let mut ans = 0;
        let mut mn = 0;
        while q.len() > 1 {
            let taken = if q.front() >= q.back() {
                q.pop_back().unwrap()
            } else {
                q.pop_front().unwrap()
            };
            if taken >= mn {
                ans += 1;
            }
            mn = mn.max(taken);
        }
        if q.pop_back().unwrap() >= mn {
            ans += 1;
        }
        sc.write(
            format!("Case #{}: {}", case_num, ans)
        );
        sc.write("\n");
    }
}

pub struct IO<R, W: std::io::Write>(R, std::io::BufWriter<W>);

impl<R: std::io::Read, W: std::io::Write> IO<R, W> {
    pub fn new(r: R, w: W) -> IO<R, W> {
        IO(r, std::io::BufWriter::new(w))
    }
    pub fn write<S: ToString>(&mut self, s: S) {
        use std::io::Write;
        self.1.write_all(s.to_string().as_bytes()).unwrap();
    }
    pub fn read<T: std::str::FromStr>(&mut self) -> T {
        use std::io::Read;
        let buf = self
            .0
            .by_ref()
            .bytes()
            .map(|b| b.unwrap())
            .skip_while(|&b| b == b' ' || b == b'\n' || b == b'\r' || b == b'\t')
            .take_while(|&b| b != b' ' && b != b'\n' && b != b'\r' && b != b'\t')
            .collect::<Vec<_>>();
        unsafe { std::str::from_utf8_unchecked(&buf) }
            .parse()
            .ok()
            .expect("Parse error.")
    }
    pub fn usize0(&mut self) -> usize {
        self.read::<usize>() - 1
    }
    pub fn vec<T: std::str::FromStr>(&mut self, n: usize) -> Vec<T> {
        (0..n).map(|_| self.read()).collect()
    }
    pub fn chars(&mut self) -> Vec<char> {
        self.read::<String>().chars().collect()
    }

    pub fn binary_vec(&mut self) -> Vec<u8> {
        self.read::<String>()
            .bytes()
            .map(|b| b - b'0')
            .collect()
    }
}

I think this is far from my mind i m python developer