#510931 (Rust) No.1106 🦉 何事もバランスが大事

• 問題: No.1106 🦉 何事もバランスが大事
• ユーザー: koba-e964
• 提出日時: 2020-07-12 14:39:18
• 言語: Rust (1.83.0 + proconio)
• 結果: CE (最新)
  AC
  (最初)
• 実行時間: -
• コード長: 3,725 bytes
• コンパイル時間: 24,702 ms
• コンパイル使用メモリ: 391,696 KB
• 最終ジャッジ日時: 2024-11-14 22:45:35
• 合計ジャッジ時間: 25,856 ms
• ジャッジサーバーID （参考情報）: judge3 / judge2

コンパイルメッセージ

error: expected one of `:`, `@`, or `|`, found `,`
  --> src/main.rs:63:19
   |
63 |     fn trans(usize, S) -> Option<usize>;
   |                   ^ expected one of `:`, `@`, or `|`
   |
   = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
help: if this is a `self` type, give it a parameter name
   |
63 |     fn trans(self: usize, S) -> Option<usize>;
   |              +++++
help: if this is a parameter name, give it a type
   |
63 |     fn trans(usize: TypeName, S) -> Option<usize>;
   |                   ++++++++++
help: if this is a type, explicitly ignore the parameter name
   |
63 |     fn trans(_: usize, S) -> Option<usize>;
   |              ++

error: expected one of `:`, `@`, or `|`, found `)`
  --> src/main.rs:63:22
   |
63 |     fn trans(usize, S) -> Option<usize>;
   |                      ^ expected one of `:`, `@`, or `|`
   |
   = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
help: if this is a parameter name, give it a type
   |
63 |     fn trans(usize, S: TypeName) -> Option<usize>;
   |                      ++++++++++
help: if this is a type, explicitly ignore the parameter name
   |
63 |     fn trans(usize, _: S) -> Option<usize>;
   |                     ++

error: could not compile `main` (bin "main") due to 2 previous errors

ソースコード

#[allow(unused_imports)]
use std::cmp::*;
#[allow(unused_imports)]
use std::collections::*;
// https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
macro_rules! input {
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
        let mut next = move || -> String{
            bytes
                .by_ref()
                .map(|r|r.unwrap() as char)
                .skip_while(|c|c.is_whitespace())
                .take_while(|c|!c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}

macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr, ) => {};
    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}

macro_rules! read_value {
    ($next:expr, [graph1; $len:expr]) => {{
        let mut g = vec![vec![]; $len];
        let ab = read_value!($next, [(usize1, usize1)]);
        for (a, b) in ab {
            g[a].push(b);
            g[b].push(a);
        }
        g
    }};
    ($next:expr, ( $($t:tt),* )) => {
        ( $(read_value!($next, $t)),* )
    };
    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };
    ($next:expr, chars) => {
        read_value!($next, String).chars().collect::<Vec<char>>()
    };
    ($next:expr, usize1) => (read_value!($next, usize) - 1);
    ($next:expr, [ $t:tt ]) => {{
        let len = read_value!($next, usize);
        read_value!($next, [$t; len])
    }};
    ($next:expr, $t:ty) => ($next().parse::<$t>().expect("Parse error"));
}

// ref: https://kuretchi.github.io/blog/entries/automaton-dp/
/// An (almost) DFA. trans is allowed to return None.
/// S: alphabet (the set consisting of letters)
trait DFA<S> {
    fn size() -> usize;
    fn trans(usize, S) -> Option<usize>;
    fn init() -> Vec<usize>;
}

const N: usize = 30;

enum GtZero {}

impl DFA<i32> for GtZero {
    fn size() -> usize {
        8 * N
    }
    fn trans(st: usize, c: i32) -> Option<usize> {
        let (delta, zero) = ((st / 2) as i32, st % 2);
        if zero == 1 && c < 0 {
            return None;
        }
        if delta + c < 0 || delta + c >= 4 * N as i32 {
            return None;
        }
        Some(2 * (delta + c) as usize + (zero & if c == 0 { 1 } else { 0 }))
    }
    fn init() -> Vec<usize> {
        vec![4 * N + 1]
    }
}

fn digital_dp<A: DFA<i32>, F>(alpha: &[i32], act: F, a: &[i32],
                 n: usize) -> Vec<[i64; 2]>
where F: Fn(i64, i32) -> i64 {
    let len = a.len();
    let init = A::init();
    let mut dp = vec![vec![[0; 2]; n]; len + 1];
    for &v in &init {
        dp[0][v][1] = 1;
    }
    for i in 0..len {
        for j in 0..n {
            for eq in 0..2 {
                let val = dp[i][j][eq];
                for &c in alpha {
                    if eq == 1 && c > a[i] {
                        continue;
                    }
                    if let Some(to) = A::trans(j, c) {
                        dp[i + 1][to][eq & if c == a[i] { 1 } else { 0 }]
                            += act(val, c);
                    }
                }
            }
        }
    }
    dp[len].clone()
}

fn main() {
    input!(n: i64);
    const N: usize = 30;
    let alpha = [-2, -1, 0, 1, 2];
    let mut dig = vec![0; N];
    let mut v = n;
    for i in 0..N {
        let mut r = v % 5;
        if r >= 3 { r -= 5; }
        dig[N - 1 - i] = r as i32;
        v = (v - r) / 5;
    }
    let act = |a: i64, _c: i32| a;
    let dp = digital_dp::<GtZero, _>(&alpha, act, &dig, 8 * N);
    println!("{}", dp[4 * N][0] + dp[4 * N][1]);
}