結果

問題 No.1330 Multiply or Divide
コンテスト
ユーザー koba-e964
提出日時 2021-01-10 18:58:14
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 59 ms / 2,000 ms
コード長 3,944 bytes
コンパイル時間 14,340 ms
コンパイル使用メモリ 384,368 KB
実行使用メモリ 7,848 KB
最終ジャッジ日時 2025-06-20 01:26:36
合計ジャッジ時間 15,311 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge3
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ファイルパターン 結果
other AC * 51
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ソースコード

diff # 

#[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, [graph1; $len:expr]) => {{
        let mut g = vec![vec![]; $len];
        let ab = read_value!($next, [(usize1, usize1)]);
        for (a, b) in ab {
            g[a].push(b);
            g[b].push(a);
        }
        g
    }};
    ($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);
        read_value!($next, [$t; len])
    }};
    ($next:expr, $t:ty) => ($next().parse::<$t>().expect("Parse error"));
}

trait Change {
    fn chmax(&mut self, x: Self);
    fn chmin(&mut self, x: Self);
}
impl<T: PartialOrd> Change for T {
    fn chmax(&mut self, x: T) {
        if *self < x { *self = x; }
    }
    fn chmin(&mut self, x: T) {
        if *self > x { *self = x; }
    }
}

#[allow(unused)]
macro_rules! debug {
    ($($format:tt)*) => (write!(std::io::stderr(), $($format)*).unwrap());
}
#[allow(unused)]
macro_rules! debugln {
    ($($format:tt)*) => (writeln!(std::io::stderr(), $($format)*).unwrap());
}

// The author read the editorial before implementing this solution.
fn solve() {
    let out = std::io::stdout();
    let mut out = BufWriter::new(out.lock());
    macro_rules! puts {
        ($($format:tt)*) => (let _ = write!(out,$($format)*););
    }
    #[allow(unused)]
    macro_rules! putvec {
        ($v:expr) => {
            for i in 0..$v.len() {
                puts!("{}{}", $v[i], if i + 1 == $v.len() {"\n"} else {" "});
            }
        }
    }
    input! {
        n: usize, m: i64, p: i64,
        a: [i64; n],
    }
    let &ma = a.iter().max().unwrap();
    let lim = m / ma;
    let mut b = a.clone();
    let mut e = vec![0; n];
    const W: usize = 30;
    let mut each = vec![0; W];
    for i in 0..n {
        while b[i] % p == 0 {
            b[i] /= p;
            e[i] += 1;
        }
        each[e[i]].chmax(b[i]);
    }
    const INF: i64 = 1 << 50;
    const N: usize = 1000;
    let mut dp = vec![-INF; N];
    dp[0] = 1;
    for i in 0..N {
        if dp[i] > lim {
            break;
        }
        if dp[i] <= -INF {
            continue;
        }
        for j in 0..W {
            if each[j] == 0 {
                continue;
            }
            let val = dp[i] * each[j];
            if i + j + 1 < N {
                dp[i + j + 1].chmax(val);
            }
        }
    }
    let mut mi = INF;
    for i in 0..N {
        if dp[i] > lim {
            mi.chmin(i as i64);
        }
    }
    puts!("{}\n", if mi < INF { mi + 1 } else { -1 });
}

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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