#663972 (Rust) No.1529 Constant Lcm

• 問題: No.1529 Constant Lcm
• ユーザー: Strorkis
• 提出日時: 2021-06-05 09:14:23
• 言語: Rust (1.77.0 + proconio)
• 結果: CE (最新)
  AC
  (最初)
• 実行時間: -
• コード長: 3,423 bytes
• コンパイル時間: 12,137 ms
• コンパイル使用メモリ: 389,228 KB
• 最終ジャッジ日時: 2024-11-15 01:26:38
• 合計ジャッジ時間: 13,070 ms
• ジャッジサーバーID （参考情報）: judge5 / judge2

コンパイルメッセージ

error: format argument must be a string literal
 --> src/main.rs:8:34
  |
8 |                 Err(e) => panic!(e), 
  |                                  ^
  |
help: you might be missing a string literal to format with
  |
8 |                 Err(e) => panic!("{}", e), 
  |                                  +++++

error: could not compile `main` (bin "main") due to 1 previous error

ソースコード

pub mod io {
    pub fn scan<R: std::io::BufRead>(r: &mut R) -> Vec<u8> {
        let mut res = Vec::new();
        loop {
            let buf = match r.fill_buf() {
                Ok(buf) => buf,
                Err(e) if e.kind() == std::io::ErrorKind::Interrupted => continue,
                Err(e) => panic!(e), 
            };
            let (done, used, buf) = {
                match buf.iter().position(u8::is_ascii_whitespace) {
                    Some(i) => (i > 0 || res.len() > 0, i + 1, &buf[..i]),
                    None => (buf.is_empty(), buf.len(), buf),
                }
            };
            res.extend_from_slice(buf);
            r.consume(used);
            if done { return res; }
        }
    }

    #[macro_export]
    macro_rules! scan {
        ($r:expr, [$t:tt; $n:expr]) => {
            (0..$n).map(|_| scan!($r, $t)).collect::<Vec<_>>()
        };
        ($r:expr, ($($t:tt),*)) => {
            ($(scan!($r, $t)),*)
        };
        ($r:expr, Usize1) => {
            scan!($r, usize) - 1
        };
        ($r:expr, Bytes) => {
            io::scan($r)
        };
        ($r:expr, String) => {
            String::from_utf8(scan!($r, Bytes)).unwrap()
        };
        ($r:expr, $t:ty) => {
            scan!($r, String).parse::<$t>().unwrap()
        };
    }

    #[macro_export]
    macro_rules! input {
        ($r:expr, $($($v:ident)* : $t:tt),* $(,)?) => {
            $(let $($v)* = scan!($r, $t);)*
        };
    }
}

const MOD: usize = 998_244_353;

pub fn pow_mod(mut a: usize, mut n: usize, m: usize) -> usize {
    let mut res = 1;
    while n > 0 {
        if n & 1 > 0 {
            res = res * a % m;
        }
        a = a * a % m;
        n >>= 1;
    }
    res
}

pub fn get_primes(n: usize) -> Vec<usize> {
    let mut primes = Vec::new();
    let mut is_prime = vec![true; n + 1];
    for p in 2..=n {
        if !is_prime[p] { continue; }
        primes.push(p);
        let mut q = 2 * p;
        while q <= n {
            is_prime[q] = false;
            q += p;
        }
    }
    primes
}

fn run<R: std::io::BufRead, W: std::io::Write>(reader: &mut R, writer: &mut W) {
    let n = scan!(reader, usize);

    let primes = get_primes(n - 1);
    let mut count = vec![0; primes.len()];
    for i in 1..n {
        let mut x = i;
        let mut y = n - i;
        for (count, p) in count.iter_mut().zip(primes.iter()) {
            if p * p > x.max(y) { break; }
            let mut c = 0;
            while x % p == 0 {
                x /= p;
                c += 1;
            }
            while y % p == 0 {
                y /= p;
                c += 1;
            }
            *count = (*count).max(c);
        }
        if x > 1 {
            let k = primes.binary_search(&x).unwrap();
            count[k] = count[k].max(if x == y { 2 } else { 1 });    
        }
        if x != y && y > 1 {
            let k = primes.binary_search(&y).unwrap();
            count[k] = count[k].max(1);
        }
    }

    let mut ans = 1;
    for (count, p) in count.into_iter().zip(primes.into_iter()) {
        ans *= pow_mod(p, count, MOD);
        ans %= MOD;
    }
    writeln!(writer, "{}", ans).ok();
}

fn main() {
    let (stdin, stdout) = (std::io::stdin(), std::io::stdout());
    let ref mut reader = std::io::BufReader::new(stdin.lock());
    let ref mut writer = std::io::BufWriter::new(stdout.lock());
    run(reader, writer);
}