#341038 (Rust) No.818 Dinner time

• 問題: No.818 Dinner time
• ユーザー: koba-e964
• 提出日時: 2019-04-20 12:35:47
• 言語: Rust (1.83.0 + proconio)
• 結果: AC
• 実行時間: 16 ms / 2,000 ms
• コード長: 2,499 bytes
• コンパイル時間: 17,885 ms
• コンパイル使用メモリ: 379,060 KB
• 実行使用メモリ: 5,248 KB
• 最終ジャッジ日時: 2024-11-29 23:38:50
• 合計ジャッジ時間: 15,188 ms
• ジャッジサーバーID （参考情報）: judge5 / judge1

ファイルパターン	結果
sample	AC * 4
other	AC * 29

ソースコード

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#[allow(unused_imports)]
use std::cmp::*;
#[allow(unused_imports)]
use std::collections::*;
use std::io::{Write, BufWriter};
// https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
macro_rules! input {
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
        let mut next = move || -> String{
            bytes
                .by_ref()
                .map(|r|r.unwrap() as char)
                .skip_while(|c|c.is_whitespace())
                .take_while(|c|!c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}
macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr, ) => {};
    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}
macro_rules! read_value {
    ($next:expr, ( $($t:tt),* )) => {
        ( $(read_value!($next, $t)),* )
    };
    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };
    ($next:expr, chars) => {
        read_value!($next, String).chars().collect::<Vec<char>>()
    };
    ($next:expr, usize1) => {
        read_value!($next, usize) - 1
    };
    ($next:expr, [ $t:tt ]) => {{
        let len = read_value!($next, usize);
        (0..len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    }};
    ($next:expr, $t:ty) => {
        $next().parse::<$t>().expect("Parse error")
    };
}
fn solve() {
    let out = std::io::stdout();
    let mut out = BufWriter::new(out.lock());
    macro_rules! puts {
        ($($format:tt)*) => (write!(out,$($format)*).unwrap());
    }
    input! {
        n: usize, m: i64,
        ab: [(i64, i64); n],
    }
    let mut mdays = vec![0; n + 1];
    let mut oneday = vec![0; n + 1];
    for i in 0..n {
        let (a, b) = ab[i];
        mdays[i + 1] = mdays[i] + max(a * m, max(b, a * (m - 1) + b));
        oneday[i + 1] = oneday[i] + max(a, b);
    }
    let mut ma = -1 << 50;
    let mut cont = -1 << 50;
    for l in (1..n + 1).rev() {
        cont = max(cont, oneday[l]);
        ma = max(ma, mdays[l] - oneday[l] + cont);
    }
    puts!("{}\n", ma);
}
fn main() {
    // In order to avoid potential stack overflow, spawn a new thread.
    let stack_size = 104_857_600; // 100 MB
    let thd = std::thread::Builder::new().stack_size(stack_size);
    thd.spawn(|| solve()).unwrap().join().unwrap();
}
 
 
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