#906622 (Rust) No.2435 Order All Company

• 問題: No.2435 Order All Company
• ユーザー: koba-e964
• 提出日時: 2023-08-21 10:31:17
• 言語: Rust (1.83.0 + proconio)
• 結果: AC
• 実行時間: 28 ms / 2,000 ms
• コード長: 7,507 bytes
• コンパイル時間: 14,759 ms
• コンパイル使用メモリ: 379,836 KB
• 実行使用メモリ: 5,248 KB
• 最終ジャッジ日時: 2024-12-14 20:45:53
• 合計ジャッジ時間: 16,822 ms
• ジャッジサーバーID （参考情報）: judge3 / judge1

ファイルパターン	結果
other	AC * 36

コンパイルメッセージ

warning: unused import: `BufWriter`
 --> src/main.rs:5:22
  |
5 | use std::io::{Write, BufWriter};
  |                      ^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: unused import: `Write`
 --> src/main.rs:5:15
  |
5 | use std::io::{Write, BufWriter};
  |               ^^^^^

ソースコード

#[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);
        read_value!($next, [$t; len])
    }};
    ($next:expr, $t:ty) => ($next().parse::<$t>().expect("Parse error"));
}

/// Verified by https://atcoder.jp/contests/abc198/submissions/21774342
mod mod_int {
    use std::ops::*;
    pub trait Mod: Copy { fn m() -> i64; }
    #[derive(Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
    pub struct ModInt<M> { pub x: i64, phantom: ::std::marker::PhantomData<M> }
    impl<M: Mod> ModInt<M> {
        // x >= 0
        pub fn new(x: i64) -> Self { ModInt::new_internal(x % M::m()) }
        fn new_internal(x: i64) -> Self {
            ModInt { x: x, phantom: ::std::marker::PhantomData }
        }
        pub fn pow(self, mut e: i64) -> Self {
            debug_assert!(e >= 0);
            let mut sum = ModInt::new_internal(1);
            let mut cur = self;
            while e > 0 {
                if e % 2 != 0 { sum *= cur; }
                cur *= cur;
                e /= 2;
            }
            sum
        }
        #[allow(dead_code)]
        pub fn inv(self) -> Self { self.pow(M::m() - 2) }
    }
    impl<M: Mod> Default for ModInt<M> {
        fn default() -> Self { Self::new_internal(0) }
    }
    impl<M: Mod, T: Into<ModInt<M>>> Add<T> for ModInt<M> {
        type Output = Self;
        fn add(self, other: T) -> Self {
            let other = other.into();
            let mut sum = self.x + other.x;
            if sum >= M::m() { sum -= M::m(); }
            ModInt::new_internal(sum)
        }
    }
    impl<M: Mod, T: Into<ModInt<M>>> Sub<T> for ModInt<M> {
        type Output = Self;
        fn sub(self, other: T) -> Self {
            let other = other.into();
            let mut sum = self.x - other.x;
            if sum < 0 { sum += M::m(); }
            ModInt::new_internal(sum)
        }
    }
    impl<M: Mod, T: Into<ModInt<M>>> Mul<T> for ModInt<M> {
        type Output = Self;
        fn mul(self, other: T) -> Self { ModInt::new(self.x * other.into().x % M::m()) }
    }
    impl<M: Mod, T: Into<ModInt<M>>> AddAssign<T> for ModInt<M> {
        fn add_assign(&mut self, other: T) { *self = *self + other; }
    }
    impl<M: Mod, T: Into<ModInt<M>>> SubAssign<T> for ModInt<M> {
        fn sub_assign(&mut self, other: T) { *self = *self - other; }
    }
    impl<M: Mod, T: Into<ModInt<M>>> MulAssign<T> for ModInt<M> {
        fn mul_assign(&mut self, other: T) { *self = *self * other; }
    }
    impl<M: Mod> Neg for ModInt<M> {
        type Output = Self;
        fn neg(self) -> Self { ModInt::new(0) - self }
    }
    impl<M> ::std::fmt::Display for ModInt<M> {
        fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
            self.x.fmt(f)
        }
    }
    impl<M: Mod> ::std::fmt::Debug for ModInt<M> {
        fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
            let (mut a, mut b, _) = red(self.x, M::m());
            if b < 0 {
                a = -a;
                b = -b;
            }
            write!(f, "{}/{}", a, b)
        }
    }
    impl<M: Mod> From<i64> for ModInt<M> {
        fn from(x: i64) -> Self { Self::new(x) }
    }
    // Finds the simplest fraction x/y congruent to r mod p.
    // The return value (x, y, z) satisfies x = y * r + z * p.
    fn red(r: i64, p: i64) -> (i64, i64, i64) {
        if r.abs() <= 10000 {
            return (r, 1, 0);
        }
        let mut nxt_r = p % r;
        let mut q = p / r;
        if 2 * nxt_r >= r {
            nxt_r -= r;
            q += 1;
        }
        if 2 * nxt_r <= -r {
            nxt_r += r;
            q -= 1;
        }
        let (x, z, y) = red(nxt_r, r);
        (x, y - q * z, z)
    }
} // mod mod_int

macro_rules! define_mod {
    ($struct_name: ident, $modulo: expr) => {
        #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
        pub struct $struct_name {}
        impl mod_int::Mod for $struct_name { fn m() -> i64 { $modulo } }
    }
}
const MOD: i64 = 998_244_353;
define_mod!(P, MOD);
type MInt = mod_int::ModInt<P>;

// O(n^3)
fn determinant(a: &[Vec<MInt>]) -> MInt {
    let n = a.len();
    assert_eq!(a[0].len(), n);
    let mut a = a.to_vec();
    let mut pos = vec![];
    let mut r = 0;
    let mut ans = MInt::new(1);
    for i in 0..n {
        for j in 0..r {
            let idx = pos[j];
            let val = a[i][idx];
            for k in 0..n {
                a[i][k] = a[i][k] - a[j][k] * val;
            }
        }
        let mut c = 0;
        while c < n && a[i][c] == 0.into() {
            c += 1;
        }
        if c >= n {
            return MInt::new(0);
        }
        if r != i {
            a.swap(r, i);
            ans = -ans;
        }
        pos.push(c);
        let aic = a[r][c];
        let aicinv = aic.inv();
        a[r][c] = 1.into();
        for j in c + 1..n {
            a[r][j] *= aicinv;
        }
        ans *= aic;
        for j in r + 1..n {
            let ajc = a[j][c];
            a[j][c] = 0.into();
            for k in c + 1..n {
                let val = ajc * a[r][k];
                a[j][k] -= val;
            }
        }
        r += 1;
    }
    ans
}
    
// O(n^3)
fn count_spanning_trees(mat: &[Vec<MInt>]) -> MInt {
    let n = mat.len();
    let mut sub = vec![vec![MInt::new(0); n - 1]; n - 1];
    for i in 0..n - 1 {
        let mut sum = MInt::new(0);
        for j in 0..n {
            if i != j {
                sum += mat[i][j];
                if j < n - 1 {
                    sub[i][j] = -mat[i][j];
                }
            }
        }
        sub[i][i] = sum;
    }
    determinant(&sub)
}

fn main() {
    input! {
        n: usize, k: usize,
        ab: [[(usize1, usize1)]; k],
    }
    let mut ans = MInt::new(0);
    for bits in 0usize..1 << k {
        let mut e = vec![vec![MInt::new(0); n]; n];
        for i in 0..k {
            if (bits & 1 << i) == 0 {
                for &(a, b) in &ab[i] {
                    e[a][b] += 1;
                    e[b][a] += 1;
                }
            }
        }
        let sub = count_spanning_trees(&e);
        if bits.count_ones() % 2 == 1 {
            ans -= sub;
        } else {
            ans += sub;
        }
    }
    println!("{}", ans);
}