#622928 (Rust) No.1407 Kindness

• 問題: No.1407 Kindness
• ユーザー: Strorkis
• 提出日時: 2021-02-26 22:00:21
• 言語: Rust (1.77.0 + proconio)
• 結果: CE (最新)
  AC
  (最初)
• 実行時間: -
• コード長: 3,891 bytes
• コンパイル時間: 13,178 ms
• コンパイル使用メモリ: 388,720 KB
• 最終ジャッジ日時: 2024-11-15 00:10:02
• 合計ジャッジ時間: 13,897 ms
• ジャッジサーバーID （参考情報）: judge2 / judge5

コンパイルメッセージ

error: format argument must be a string literal
 --> src/main.rs:8:34
  |
8 |                 Err(e) => panic!(e), 
  |                                  ^
  |
help: you might be missing a string literal to format with
  |
8 |                 Err(e) => panic!("{}", e), 
  |                                  +++++

error: could not compile `main` (bin "main") due to 1 previous error

ソースコード

mod io {
    pub fn scan<R: std::io::BufRead>(r: &mut R) -> Vec<u8> {
        let mut res = Vec::new();
        loop {
            let buf = match r.fill_buf() {
                Ok(buf) => buf,
                Err(e) if e.kind() == std::io::ErrorKind::Interrupted => continue,
                Err(e) => panic!(e), 
            };
            let (done, used, buf) = {
                match buf.iter().position(u8::is_ascii_whitespace) {
                    Some(i) => (i > 0 || res.len() > 0, i + 1, &buf[..i]),
                    None => (buf.is_empty(), buf.len(), buf),
                }
            };
            res.extend_from_slice(buf);
            r.consume(used);
            if done { return res; }
        }
    }
}

#[allow(dead_code)]
mod mod_int {
    #[derive(Clone, Copy)]
    pub struct ModInt(pub i64);

    impl ModInt {
        const MOD: i64 = 1_000_000_007;

        pub fn new(x: i64) -> ModInt {
            Self(x % Self::MOD)
        }
    }

    impl std::ops::Add for ModInt {
        type Output = Self;

        fn add(self, other: Self) -> Self {
            let x = self.0 + other.0;
            if x < Self::MOD { Self(x) } else { Self(x - Self::MOD) }
        }
    }

    impl std::ops::AddAssign for ModInt {
        fn add_assign(&mut self, other: Self) {
            *self = *self + other;
        }
    }

    impl std::ops::Sub for ModInt {
        type Output = Self;

        fn sub(self, other: Self) -> Self {
            if self.0 < other.0 {
                Self(self.0 + Self::MOD - other.0)
            } else {
                Self(self.0 - other.0)
            }
        }
    }

    impl std::ops::SubAssign for ModInt {
        fn sub_assign(&mut self, other: Self) {
            *self = *self - other;
        }
    }

    impl std::ops::Mul for ModInt {
        type Output = Self;

        fn mul(self, other: Self) -> Self {
            Self::new(self.0 * other.0)
        }
    }

    impl std::ops::MulAssign for ModInt {
        fn mul_assign(&mut self, other: Self) {
            *self = *self * other;
        }
    }

    impl std::fmt::Display for ModInt {
        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
            write!(f, "{}", self.0)
        }
    }

    impl From<usize> for ModInt {
        fn from(x: usize) -> Self {
            Self(x as i64)
        }
    }
}

use mod_int::ModInt;

#[allow(unused_macros)]
fn run<R: std::io::BufRead, W: std::io::Write>(reader: &mut R, writer: &mut W) {
    macro_rules! scan {
        ([$t:tt; $n:expr]) => ((0..$n).map(|_| scan!($t)).collect::<Vec<_>>());
        (($($t:tt),*)) => (($(scan!($t)),*));
        ([u8]) => (io::scan(reader));
        (String) => (unsafe { String::from_utf8_unchecked(scan!([u8])) });
        ($t:ty) => (scan!(String).parse::<$t>().unwrap());
    }
    macro_rules! print {
        ($($arg:tt)*) => (write!(writer, $($arg)*).ok());
    }
    macro_rules! println {
        ($($arg:tt)*) => (writeln!(writer, $($arg)*).ok());
    }

    let n = scan!([u8]);

    let mut dp = [ModInt(1), ModInt(0)];
    for (k, d) in n.into_iter().enumerate() {
        let d = (d - b'0') as usize;
        let mut next = [ModInt(0), ModInt(0)];
        for i in 1..10 {
            let v = ModInt::from(i);
            if i < d {
                next[1] += (dp[0] + dp[1]) * v;
            } else if i == d {
                next[0] += dp[0] * v;
                next[1] += dp[1] * v;
            } else {
                next[1] += dp[1] * v;
            }
            if k > 0 {
                next[1] += v;
            }
        }
        dp = next;
    }
    println!("{}", dp[0] + dp[1]);
}

fn main() {
    let (stdin, stdout) = (std::io::stdin(), std::io::stdout());
    let mut reader = std::io::BufReader::new(stdin.lock());
    let mut writer = std::io::BufWriter::new(stdout.lock());
    run(&mut reader, &mut writer);
}