結果

問題 No.1020 Reverse
ユーザー cotton_fn_
提出日時 2020-04-10 21:26:25
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 4,606 bytes
コンパイル時間 14,381 ms
コンパイル使用メモリ 383,148 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-09-15 19:00:17
合計ジャッジ時間 14,366 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge6
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 15
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#![allow(unused)]
use kyoproio::*;
use std::{
    io::{self, prelude::*},
    collections::*,
    iter,
    mem::{replace, swap},
};
fn main() -> io::Result<()> {
    std::thread::Builder::new()
        .stack_size(10 * 1024 * 1024)
        .spawn(solve)?
        .join()
        .unwrap();
    Ok(())
}
fn solve() {
    let stdin = io::stdin();
    let mut kin = KInput::new(stdin.lock());
    let stdout = io::stdout();
    let mut out = io::BufWriter::new(stdout.lock());
    macro_rules! output {
        ($($args:expr),+) => { write!(&mut out, $($args),+) };
    }
    macro_rules! outputln {
        ($($args:expr),+) => { output!($($args),+); outputln!(); };
        () => { output!("\n"); if cfg!(debug_assertions) { out.flush(); } }
    }
    let (n, k): (usize, usize) = kin.input();
    let mut s = kin.bytes().to_owned();
    if (n - k) % 2 == 0 {
        s[..k - 1].reverse();
    }
    s.rotate_left(k - 1);
    out.write(&s);
    outputln!();
}
pub struct Pcg(u64);
const MUL: u64 = 5129263795064623965;
const INC: u64 = 4280768313201238837;
impl Pcg {
    pub fn new(seed: u64) -> Self {
        Self(seed.wrapping_add(INC))
    }
    pub fn next_u32(&mut self) -> u32 {
        // PCG-XSH-RR
        let mut x = self.0;
        self.0 = x.wrapping_mul(MUL).wrapping_add(INC);
        x ^= x >> 18;
        ((x >> 27) as u32).rotate_right((x >> 59) as u32)
    }
}
// -----------------------------------------------------------------------------
pub mod kyoproio {
    #![warn(unused)]
    use std::io::prelude::*;
    pub trait Input {
        fn str(&mut self) -> &str;
        fn bytes(&mut self) -> &[u8] {
            self.str().as_ref()
        }
        fn input<T: InputParse>(&mut self) -> T {
            T::input(self).expect("input error")
        }
        fn iter<T: InputParse>(&mut self) -> Iter<T, Self> {
            Iter(self, std::marker::PhantomData)
        }
        fn seq<T: InputParse, B: std::iter::FromIterator<T>>(&mut self, n: usize) -> B {
            self.iter().take(n).collect()
        }
    }
    pub struct KInput<R> {
        src: R,
        buf: String,
        pos: usize,
    }
    impl<R: BufRead> KInput<R> {
        pub fn new(src: R) -> Self {
            Self {
                src,
                buf: String::with_capacity(1024),
                pos: 0,
            }
        }
    }
    impl<R: BufRead> Input for KInput<R> {
        fn str(&mut self) -> &str {
            loop {
                if self.pos >= self.buf.len() {
                    self.pos = 0;
                    self.buf.clear();
                    if self.src.read_line(&mut self.buf).expect("io error") == 0 {
                        return &self.buf;
                    }
                }
                let range = self.pos
                    ..self.buf[self.pos..]
                        .find(|c: char| c.is_ascii_whitespace())
                        .map(|i| i + self.pos)
                        .unwrap_or_else(|| self.buf.len());
                self.pos = range.end + 1;
                if range.end > range.start {
                    return &self.buf[range];
                }
            }
        }
    }
    pub struct Iter<'a, T, I: ?Sized>(&'a mut I, std::marker::PhantomData<*const T>);
    impl<'a, T: InputParse, I: Input + ?Sized> Iterator for Iter<'a, T, I> {
        type Item = T;
        fn next(&mut self) -> Option<Self::Item> {
            Some(self.0.input())
        }
    }
    pub trait InputParse: Sized {
        type Err: std::fmt::Debug;
        fn input<I: Input + ?Sized>(input: &mut I) -> Result<Self, Self::Err>;
    }
    macro_rules! from_str_impls {
        { $($T:ty)* } => {
            $(impl InputParse for $T {
                type Err = <$T as std::str::FromStr>::Err;
                fn input<I: Input + ?Sized>(input: &mut I) -> Result<Self, Self::Err> {
                    input.str().parse::<$T>()
                }
            })*
        };
    }
    from_str_impls! {
        String char bool f32 f64 isize i8 i16 i32 i64 i128 usize u8 u16 u32 u64 u128
    }
    macro_rules! tuple_impls {
        ($H:ident $($T:ident)*) => {
            impl<$H: InputParse, $($T: InputParse),*> InputParse for ($H, $($T),*) {
                type Err = std::convert::Infallible;
                fn input<I: Input + ?Sized>(input: &mut I) -> Result<Self, Self::Err> {
                    // ?
                    Ok(($H::input(input).unwrap(), $($T::input(input).unwrap()),*))
                }
            }
            tuple_impls!($($T)*);
        };
        () => {};
    }
    tuple_impls!(A B C D E F G);
}
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