#542572 (Rust) No.1203 お菓子ゲーム

• 問題: No.1203 お菓子ゲーム
• ユーザー: koba-e964
• 提出日時: 2020-08-28 23:11:03
• 言語: Rust (1.83.0 + proconio)
• 結果: AC
• 実行時間: 122 ms / 2,000 ms
• コード長: 3,320 bytes
• コンパイル時間: 12,574 ms
• コンパイル使用メモリ: 404,456 KB
• 実行使用メモリ: 6,820 KB
• 最終ジャッジ日時: 2025-02-20 23:29:38
• 合計ジャッジ時間: 18,129 ms
• ジャッジサーバーID （参考情報）: judge4 / judge3

ファイルパターン	結果
other	AC * 51

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, [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::<$t>().expect("Parse error"));
}
#[allow(unused)]
macro_rules! debug {
    ($($format:tt)*) => (write!(std::io::stderr(), $($format)*).unwrap());
}
#[allow(unused)]
macro_rules! debugln {
    ($($format:tt)*) => (writeln!(std::io::stderr(), $($format)*).unwrap());
}
fn divs(x: i64) -> Vec<i64> {
    let mut i = 1;
    let mut ans = vec![];
    while i * i <= x {
        if x % i == 0 {
            ans.push(i);
            if i * i != x {
                ans.push(x / i);
            }
        }
        i += 1;
    }
    ans
}
fn solve() {
    let out = std::io::stdout();
    let mut out = BufWriter::new(out.lock());
    macro_rules! puts {
        ($($format:tt)*) => (let _ = write!(out,$($format)*););
    }
    input! {
        xy: [(i64, i64)],
    }
    const W: i64 = 100_000_000;
    for (x, y) in xy {
        let x = min(x, y - x);
        if x * 2 == y {
            puts!("0\n");
            continue;
        }
        let mut tot: i64 = 0;
        tot += W / y; // 2 | a
        for a in divs(y) {
            if a > W { continue; }
            if a % 2 == 0 { continue; }
            let num = (y / a).saturating_mul((a * a - 1) / 2);
            if 0 < num && num <= W * x && num % x == 0 {
                let b = num / x;
                if a < b {
                    tot += 1;
                }
            }
        }
        puts!("{}\n", tot);
    }
}
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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