#463837 (Rust) No.320 眠れない夜に

• 問題: No.320 眠れない夜に
• ユーザー: cotton_fn_
• 提出日時: 2020-04-13 23:31:49
• 言語: Rust (1.77.0 + proconio)
• 結果: AC
• 実行時間: 2 ms / 2,000 ms
• コード長: 4,171 bytes
• コンパイル時間: 17,786 ms
• コンパイル使用メモリ: 390,392 KB
• 実行使用メモリ: 6,820 KB
• 最終ジャッジ日時: 2024-10-01 05:32:07
• 合計ジャッジ時間: 16,321 ms
• ジャッジサーバーID （参考情報）: judge5 / judge2

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	1 ms; 6,816 KB
testcase_01	AC	1 ms; 6,816 KB
testcase_02	AC	1 ms; 6,816 KB
testcase_03	AC	1 ms; 6,820 KB
testcase_04	AC	2 ms; 6,820 KB
testcase_05	AC	1 ms; 6,816 KB
testcase_06	AC	1 ms; 6,816 KB
testcase_07	AC	1 ms; 6,820 KB
testcase_08	AC	1 ms; 6,816 KB
testcase_09	AC	1 ms; 6,820 KB
testcase_10	AC	1 ms; 6,816 KB
testcase_11	AC	2 ms; 6,816 KB
testcase_12	AC	1 ms; 6,816 KB
testcase_13	AC	1 ms; 6,820 KB
testcase_14	AC	2 ms; 6,816 KB
testcase_15	AC	1 ms; 6,816 KB
testcase_16	AC	1 ms; 6,820 KB
testcase_17	AC	1 ms; 6,816 KB
testcase_18	AC	2 ms; 6,820 KB
testcase_19	AC	1 ms; 6,816 KB
testcase_20	AC	1 ms; 6,816 KB
testcase_21	AC	1 ms; 6,820 KB
testcase_22	AC	2 ms; 6,820 KB
testcase_23	AC	1 ms; 6,820 KB
testcase_24	AC	1 ms; 6,816 KB
testcase_25	AC	1 ms; 6,816 KB
testcase_26	AC	1 ms; 6,816 KB
testcase_27	AC	1 ms; 6,816 KB
testcase_28	AC	2 ms; 6,816 KB
testcase_29	AC	2 ms; 6,816 KB
testcase_30	AC	1 ms; 6,816 KB
testcase_31	AC	1 ms; 6,820 KB
testcase_32	AC	1 ms; 6,820 KB
testcase_33	AC	1 ms; 6,820 KB
testcase_34	AC	1 ms; 6,820 KB

ソースコード

#![allow(unused)]

use kyoproio::*;
use std::{
    collections::*,
    io::{self, prelude::*},
    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, i64) = kin.input();
    let mut fiv = [1i64; 81];
    for i in 2..=n {
        fiv[i] = fiv[i - 1] + fiv[i - 2];
    }
    if k > fiv[n] {
        outputln!("-1");
        return;
    }
    let mut d = fiv[n - 1] - k;
    dbg!(d);
    let mut ans = 0;
    for &x in fiv[..n - 2].iter().rev() {
        if d >= x {
            d -= x;
            ans += 1;
        }
    }
    if d != 0 {
        ans = -1;
    }
    outputln!("{}", ans);
}

// -----------------------------------------------------------------------------
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)
        }
        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 {
        fn input<I: Input + ?Sized>(input: &mut I) -> Self;
    }
    macro_rules! from_str_impl {
        { $($T:ty)* } => {
            $(impl InputParse for $T {
                fn input<I: Input + ?Sized>(input: &mut I) -> Self {
                    input.str().parse::<$T>().expect("parse error")
                }
            })*
        };
    }
    from_str_impl! {
        String char bool f32 f64 isize i8 i16 i32 i64 i128 usize u8 u16 u32 u64 u128
    }
    macro_rules! tuple_impl {
        ($H:ident $($T:ident)*) => {
            impl<$H: InputParse, $($T: InputParse),*> InputParse for ($H, $($T),*) {
                fn input<I: Input + ?Sized>(input: &mut I) -> Self {
                    ($H::input(input), $($T::input(input)),*)
                }
            }
            tuple_impl!($($T)*);
        };
        () => {};
    }
    tuple_impl!(A B C D E F G);
}