結果

問題 No.796 well known
コンテスト
ユーザー MasuqaT
提出日時 2019-05-02 19:50:14
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 2,418 bytes
コンパイル時間 13,394 ms
コンパイル使用メモリ 399,292 KB
実行使用メモリ 6,820 KB
最終ジャッジ日時 2024-12-31 13:38:32
合計ジャッジ時間 13,538 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge2
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 * 2
other AC * 15
権限があれば一括ダウンロードができます
コンパイルメッセージ
warning: unused `Result` that must be used
  --> src/main.rs:90:13
   |
90 |             write!(writer, "3 3{}", " 1".repeat(n - 2));
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled
   = note: `#[warn(unused_must_use)]` on by default
   = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: unused `Result` that must be used
  --> src/main.rs:93:13
   |
93 |             write!(writer, "3 2{}", " 1".repeat(n - 2));
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled
   = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: unused `Result` that must be used
  --> src/main.rs:96:13
   |
96 |             write!(writer, "3{}", " 1".repeat(n - 1));
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled
   = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)

ソースコード

diff # 

use std::io;
use std::io::{BufRead, Write};

macro_rules! input {
    (stdin = $stdin:expr, $($r:tt)*) => {
        let s = {
            let mut s = String::new();
            $stdin.read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};

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

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };

    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };

    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };

    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };

    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

#[allow(unused_macros)]
macro_rules! assert_judge {
    ($method:ident, $input:expr, $expected:expr) => {
        {
            let input = $input.as_bytes();
            let mut output = Vec::new();

            $method(&input[..], &mut output);

            let output = String::from_utf8(output).expect("Not UTF-8");

            assert_eq!($expected, output);
        }
    };
}

fn main() {
    let stdio = io::stdin();
    let input = stdio.lock();

    let output = io::stdout();

    process(input, output);
}

// 2 -> 3 1 -> 4
// 3 -> 3 3 1 -> 7
// 4 -> 3 2 1 1 -> 7
// 5 -> 3 1 1 1 1 -> 7
// 6 -> 3 3 1 1 1 1 -> 10
// 7 -> 3 2 1 1 1 1 1 -> 10

fn process<R, W>(mut reader: R, mut writer: W) -> () where
    R: BufRead,
    W: Write {
    input! {
        stdin = reader,
        n: usize
    }

    match n % 3 {
        0 => {
            write!(writer, "3 3{}", " 1".repeat(n - 2));
        }
        1 => {
            write!(writer, "3 2{}", " 1".repeat(n - 2));
        }
        2 => {
            write!(writer, "3{}", " 1".repeat(n - 1));
        }
        _ => {}
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn sample1() {
        assert_judge!(process, "3", "12344 12632 2142\
        ");
    }

    #[test]
    fn sample2() {
        assert_judge!(process, "4", "4086 3264 1123 2478\
        ");
    }
}
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