結果

問題 No.475 最終日 - Writerの怠慢
ユーザー hatoohatoo
提出日時 2017-10-19 13:27:14
言語 Rust
(1.77.0 + proconio)
結果
AC  
実行時間 12 ms / 2,000 ms
コード長 3,057 bytes
コンパイル時間 12,536 ms
コンパイル使用メモリ 402,668 KB
実行使用メモリ 6,820 KB
最終ジャッジ日時 2024-11-21 07:34:27
合計ジャッジ時間 14,104 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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テストケース

テストケース表示
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
6,820 KB
testcase_02 AC 1 ms
6,820 KB
testcase_03 AC 2 ms
6,816 KB
testcase_04 AC 12 ms
6,816 KB
testcase_05 AC 12 ms
6,820 KB
testcase_06 AC 12 ms
6,816 KB
testcase_07 AC 12 ms
6,816 KB
testcase_08 AC 12 ms
6,820 KB
testcase_09 AC 12 ms
6,820 KB
testcase_10 AC 12 ms
6,816 KB
testcase_11 AC 12 ms
6,816 KB
testcase_12 AC 5 ms
6,820 KB
testcase_13 AC 10 ms
6,816 KB
testcase_14 AC 1 ms
6,816 KB
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 variable: `x`
   --> src/main.rs:115:20
    |
115 |         .map(|(r, &x)| {
    |                    ^ help: if this is intentional, prefix it with an underscore: `_x`
    |
    = note: `#[warn(unused_variables)]` on by default

ソースコード

diff #

#[allow(unused_imports)]
use std::cmp::{max, min, Ordering, Reverse};
#[allow(unused_imports)]
use std::collections::{HashMap, HashSet};

mod util {
    use std::io::stdin;
    use std::str::FromStr;
    use std::fmt::Debug;

    #[allow(dead_code)]
    pub fn line() -> String {
        let mut line: String = String::new();
        stdin().read_line(&mut line).unwrap();
        line.trim().to_string()
    }

    #[allow(dead_code)]
    pub fn get<T: FromStr>() -> T
    where
        <T as FromStr>::Err: Debug,
    {
        let mut line: String = String::new();
        stdin().read_line(&mut line).unwrap();
        line.trim().parse().unwrap()
    }

    #[allow(dead_code)]
    pub fn gets<T: FromStr>() -> Vec<T>
    where
        <T as FromStr>::Err: Debug,
    {
        let mut line: String = String::new();
        stdin().read_line(&mut line).unwrap();
        line.split_whitespace()
            .map(|t| t.parse().unwrap())
            .collect()
    }

    #[allow(dead_code)]
    pub fn get2<T: FromStr, U: FromStr>() -> (T, U)
    where
        <T as FromStr>::Err: Debug,
        <U as FromStr>::Err: Debug,
    {
        let mut line: String = String::new();
        stdin().read_line(&mut line).unwrap();
        let mut iter = line.split_whitespace();
        (
            iter.next().unwrap().parse().unwrap(),
            iter.next().unwrap().parse().unwrap(),
        )
    }

    #[allow(dead_code)]
    pub fn get3<S: FromStr, T: FromStr, U: FromStr>() -> (S, T, U)
    where
        <S as FromStr>::Err: Debug,
        <T as FromStr>::Err: Debug,
        <U as FromStr>::Err: Debug,
    {
        let mut line: String = String::new();
        stdin().read_line(&mut line).unwrap();
        let mut iter = line.split_whitespace();
        (
            iter.next().unwrap().parse().unwrap(),
            iter.next().unwrap().parse().unwrap(),
            iter.next().unwrap().parse().unwrap(),
        )
    }
}

// std::cmp::Reverse doesn't have Clone.
#[derive(Eq, PartialEq, Clone)]
struct Rev<T>(pub T);

impl<T: PartialOrd> PartialOrd for Rev<T> {
    fn partial_cmp(&self, other: &Rev<T>) -> Option<Ordering> {
        other.0.partial_cmp(&self.0)
    }
}

impl<T: Ord> Ord for Rev<T> {
    fn cmp(&self, other: &Rev<T>) -> Ordering {
        other.0.cmp(&self.0)
    }
}

#[allow(unused_macros)]
macro_rules! debug {
    ($x: expr) => {
        println!("{}: {:?}", stringify!($x), $x)
    }
}


fn score(s: usize, rank: usize) -> usize {
    let rhs = 500 * s / (8 + 2 * rank);
    50 * s + rhs
}

fn main() {
    let (n, s, id): (usize, usize, usize) = util::get3();
    let mut a: Vec<usize> = util::gets();

    let me = a[id] + 100 * s;
    a.remove(id);
    a.sort();

    let m = n - 1;

    let mut i = 0;
    let ans = a.iter()
        .enumerate()
        .map(|(r, &x)| {
            while i < m && a[i] + score(s, r + 1) <= me {
                i += 1;
            }

            max(0, i as i64 - (r as i64)) as f64 / (m - r) as f64
        })
        .fold(1.0, |a, b| a * b);

    println!("{}", ans);

}
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