#735260 (Rust) No.1822 Keima of Shogi

• 問題: No.1822 Keima of Shogi
• ユーザー: Strorkis
• 提出日時: 2022-01-28 22:36:20
• 言語: Rust (1.77.0 + proconio)
• 結果: AC
• 実行時間: 1 ms / 2,000 ms
• コード長: 6,626 bytes
• コンパイル時間: 15,868 ms
• コンパイル使用メモリ: 380,040 KB
• 実行使用メモリ: 5,248 KB
• 最終ジャッジ日時: 2024-12-30 08:47:20
• 合計ジャッジ時間: 16,729 ms
• ジャッジサーバーID （参考情報）: judge5 / judge3

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	1 ms; 5,248 KB
testcase_01	AC	1 ms; 5,248 KB
testcase_02	AC	1 ms; 5,248 KB
testcase_03	AC	1 ms; 5,248 KB
testcase_04	AC	1 ms; 5,248 KB
testcase_05	AC	1 ms; 5,248 KB
testcase_06	AC	1 ms; 5,248 KB
testcase_07	AC	1 ms; 5,248 KB
testcase_08	AC	1 ms; 5,248 KB
testcase_09	AC	1 ms; 5,248 KB

ソースコード

pub mod input {
    pub trait Readable {
        type Output;

        fn read<R: std::io::BufRead>(r: &mut R) -> Self::Output;
    }

    macro_rules! impl_readable_for_int {
        ($($t:ty)*) => ($(impl Readable for $t {
            type Output = $t;

            #[inline]
            fn read<R: std::io::BufRead>(r: &mut R) -> Self::Output {
                let mut is_positive = true;
                let mut is_empty = true;
                let mut is_only_sign = true;
                let mut result: Self::Output = 0;
                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, mut buf) = match buf.iter().position(u8::is_ascii_whitespace) {
                        Some(i) => (i > 0 || !is_empty, i + 1, &buf[..i]),
                        None => (buf.is_empty(), buf.len(), buf),
                    };
        
                    if is_empty && buf.len() > 0 {
                        is_empty = false;
                        buf = match buf[0] {
                            b'+' => &buf[1..],
                            b'-' => {
                                is_positive = false;
                                &buf[1..]
                            }
                            _ => buf,
                        };
                    }
                    if buf.len() > 0 {
                        is_only_sign = false;
                    }
        
                    if is_positive {
                        for &c in buf {
                            let x = (c as char).to_digit(10).expect("InvalidDigit");
                            result = result.checked_mul(10).expect("PosOverflow");
                            result = result.checked_add(x as $t).expect("PosOverflow");
                        }
                    } else {
                        for &c in buf {
                            let x = (c as char).to_digit(10).expect("InvalidDigit");
                            result = result.checked_mul(10).expect("NegOverflow");
                            result = result.checked_sub(x as $t).expect("NegOverflow");
                        }
                    }
        
                    r.consume(used);
        
                    if done {
                        if is_empty {
                            panic!("Empty");
                        }
                        if is_only_sign {
                            panic!("InvalidDigit");
                        }        
                        return result;
                    }
                }
            }
        })*)
    }
    impl_readable_for_int! { i8 i16 i32 i64 i128 isize u8 u16 u32 u64 u128 usize }

    pub mod marker {
        use super::Readable;
        
        pub enum Usize1 {}

        impl Readable for Usize1 {
            type Output = usize;

            #[inline]
            fn read<R: std::io::BufRead>(r: &mut R) -> Self::Output {
                usize::read(r).checked_sub(1).expect("NegOverflow")
            }
        }

        pub enum Bytes {}

        impl Readable for Bytes {
            type Output = Vec<u8>;

            #[inline]
            fn read<R: std::io::BufRead>(r: &mut R) -> Self::Output {
                let mut result = 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 || !result.is_empty(), i + 1, &buf[..i]),
                        None => (buf.is_empty(), buf.len(), buf),
                    };
                    result.extend_from_slice(buf);
                    r.consume(used);
                    if done { return result; }
                }
            }
        }
    }

    impl Readable for String {
        type Output = String;

        #[inline]
        fn read<R: std::io::BufRead>(r: &mut R) -> Self::Output {
            String::from_utf8(marker::Bytes::read(r)).unwrap()
        }
    }

    macro_rules! impl_readable_for_float {
        ($($t:ty)*) => ($(impl Readable for $t {
            type Output = $t;
            
            #[inline]
            fn read<R: std::io::BufRead>(r: &mut R) -> Self::Output {
                String::read(r).parse().unwrap()
            }
        })*)
    }
    impl_readable_for_float! { f32 f64 }

    macro_rules! impl_readable_for_tuple {
        ($head:ident, $($tail:ident),*) => {
            impl<$head, $($tail),*> Readable for ($head, $($tail),*)
            where
                $head: Readable,
                $($tail: Readable),*,
            {
                type Output = (
                    <$head as Readable>::Output,
                    $(<$tail as Readable>::Output),*,
                );

                #[inline]
                fn read<R: std::io::BufRead>(r: &mut R) -> Self::Output {    
                    (<$head>::read(r), $(<$tail>::read(r)),*)
                }
            }
            impl_readable_for_tuple!($($tail),*);
        };
        ($head:ident) => {};
    }
    impl_readable_for_tuple!(A, B, C, D, E, F, G, H, I, J);

    #[macro_export]
    macro_rules! read {
        ($r:expr, [$t:tt; $n:expr]) => {{
            <[_; $n]>::try_from(read!($r, ($t; $n)).as_slice()).unwrap()
        }};
        ($r:expr, ($t:tt)) => {
            read!($r, ($t; read!($r, usize)))
        };
        ($r:expr, ($t:tt; $n:expr)) => {
            (0..$n).map(|_| read!($r, $t)).collect::<Vec<_>>()
        };
        ($r:expr, $t:ty) => {
            <$t>::read($r)
        };
    }

    #[macro_export]
    macro_rules! input {
        ($r:expr, $($($v:ident)* : $t:tt),* $(,)?) => {$(
            let $($v)* = read!($r, $t);
        )*};
    }
}

use input::Readable;

fn run<R: std::io::BufRead, W: std::io::Write>(reader: &mut R, _writer: &mut W) {
    input! {
        reader,
        n: u64,
    }

    let k = (n + 1) / 2;
    let ans = (1 + k) * k / 2;
    println!("{}", ans);
}

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