結果

問題 No.1304 あなたは基本が何か知っていますか？私は知っています．
コンテスト
ユーザー cympfh
提出日時 2020-12-01 15:23:27
言語 Rust
(1.83.0 + proconio)
結果
TLE  
実行時間 -
コード長 9,996 bytes
コンパイル時間 13,086 ms
コンパイル使用メモリ 401,892 KB
実行使用メモリ 7,844 KB
最終ジャッジ日時 2025-06-22 02:38:56
合計ジャッジ時間 17,737 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 1
other AC * 3 TLE * 1 -- * 70
権限があれば一括ダウンロードができます

ソースコード

diff # 

#![allow(unused_imports, unused_macros, dead_code)]

macro_rules! min {
    (.. $x:expr) => {{
        let mut it = $x.iter();
        it.next().map(|z| it.fold(z, |x, y| min!(x, y)))
    }};
    ($x:expr) => ($x);
    ($x:expr, $($ys:expr),*) => {{
        let t = min!($($ys),*);
        if $x < t { $x } else { t }
    }}
}
macro_rules! max {
    (.. $x:expr) => {{
        let mut it = $x.iter();
        it.next().map(|z| it.fold(z, |x, y| max!(x, y)))
    }};
    ($x:expr) => ($x);
    ($x:expr, $($ys:expr),*) => {{
        let t = max!($($ys),*);
        if $x > t { $x } else { t }
    }}
}
macro_rules! trace {
    ($x:expr) => {
        #[cfg(debug_assertions)]
        eprintln!(">>> {} = {:?}", stringify!($x), $x)
    };
    ($($xs:expr),*) => { trace!(($($xs),*)) }
}
macro_rules! flush {
    () => {
        std::io::stdout().flush().unwrap();
    };
}
macro_rules! put {
    (.. $x:expr) => {{
        let mut it = $x.iter();
        if let Some(x) = it.next() { print!("{}", x); }
        for x in it { print!(" {}", x); }
        println!("");
    }};
    ($x:expr) => { println!("{}", $x) };
    ($x:expr, $($xs:expr),*) => { print!("{} ", $x); put!($($xs),*) }
}

const M: i64 = 1_000_000_007;

macro_rules! mint {
    ($x:expr) => {
        ModInt::new($x, MOD_998244353)
    };
}

fn main() {
    let mut sc = Scanner::new();
    let n: usize = sc.cin();
    let k: usize = sc.cin();
    let x: u64 = sc.cin();
    let y: u64 = sc.cin();
    let xs: Vec<u64> = sc.vec(k);

    if x >= 1024 {
        put!(0);
        return;
    }
    let y = min!(y + 1, 1024);
    let required = x..y;

    let xs = dup(xs);
    let k = xs.len();

    let mut t = DefaultDict::new(0);

    for p in PowerPermutation::new(k, n / 2) {
        let mut ok = true;
        for i in 1..n / 2 {
            if p[i - 1] == p[i] {
                ok = false
            }
        }
        if !ok {
            continue;
        }

        let mut s = 0;
        let last = xs[p[0]];
        for i in 0..n / 2 {
            s ^= xs[p[i]];
        }
        t[(s, last)] += 1;
    }

    let mut ans = mint!(0);
    for (&(s, last), k) in t.iter() {
        for x in required.clone() {
            for b in 0..1024 {
                if b == last {
                    continue;
                }
                ans += k * t[(s ^ x, b)];
            }
        }
    }

    put!(ans);
}

/// 重複排除
fn dup<T: Clone + Eq + Ord>(xs: Vec<T>) -> Vec<T> {
    use std::collections::BTreeSet;
    xs.iter()
        .cloned()
        .collect::<BTreeSet<_>>()
        .iter()
        .cloned()
        .collect()
}

// @collections/defaultdict
#[derive(Debug, Clone)]
pub struct DefaultDict<K, V>
where
    K: Eq + std::hash::Hash,
{
    data: std::collections::HashMap<K, V>,
    default: V,
}
impl<K: Eq + std::hash::Hash, V> DefaultDict<K, V> {
    pub fn new(default: V) -> DefaultDict<K, V> {
        DefaultDict {
            data: std::collections::HashMap::new(),
            default,
        }
    }
    pub fn keys(&self) -> std::collections::hash_map::Keys<K, V> {
        self.data.keys()
    }
    pub fn iter(&self) -> std::collections::hash_map::Iter<K, V> {
        self.data.iter()
    }
    pub fn len(&self) -> usize {
        self.data.len()
    }
}
impl<K: Eq + std::hash::Hash, V> std::ops::Index<K> for DefaultDict<K, V> {
    type Output = V;
    fn index(&self, key: K) -> &Self::Output {
        if let Some(val) = self.data.get(&key) {
            val
        } else {
            &self.default
        }
    }
}
impl<K: Eq + std::hash::Hash + Clone, V: Clone> std::ops::IndexMut<K> for DefaultDict<K, V> {
    fn index_mut(&mut self, key: K) -> &mut Self::Output {
        let val = self.default.clone();
        self.data.entry(key.clone()).or_insert(val);
        self.data.get_mut(&key).unwrap()
    }
}

// @num/iter/power
pub struct PowerPermutation {
    n: usize,
    m: usize,
    ar: Vec<usize>,
}
impl PowerPermutation {
    pub fn new(n: usize, m: usize) -> PowerPermutation {
        let ar = vec![0; m];
        PowerPermutation { n: n, m: m, ar: ar }
    }
}
impl Iterator for PowerPermutation {
    type Item = Vec<usize>;
    fn next(&mut self) -> Option<Vec<usize>> {
        if self.ar[self.m - 1] >= self.n {
            return None;
        }
        let r = self.ar.clone();
        self.ar[0] += 1;
        for i in 0..self.m - 1 {
            if self.ar[i] == self.n {
                self.ar[i] = 0;
                self.ar[i + 1] += 1;
            } else {
                break;
            }
        }
        return Some(r);
    }
}

// @algebra/modint
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub struct ModInt(pub i64, pub i64); // (residual, modulo)

pub const MOD_1000000007: i64 = 1_000_000_007;
pub const MOD_998244353: i64 = 998_244_353;

impl ModInt {
    pub fn new(residual: i64, modulo: i64) -> ModInt {
        if residual >= modulo {
            ModInt(residual % modulo, modulo)
        } else if residual < 0 {
            ModInt((residual % modulo) + modulo, modulo)
        } else {
            ModInt(residual, modulo)
        }
    }
    pub fn unwrap(self) -> i64 {
        self.0
    }
    pub fn inv(self) -> Self {
        fn exgcd(r0: i64, a0: i64, b0: i64, r: i64, a: i64, b: i64) -> (i64, i64, i64) {
            if r > 0 {
                exgcd(r, a, b, r0 % r, a0 - r0 / r * a, b0 - r0 / r * b)
            } else {
                (a0, b0, r0)
            }
        }
        let (a, _, r) = exgcd(self.0, 1, 0, self.1, 0, 1);
        if r != 1 {
            panic!("{:?} has no inverse!", self);
        }
        ModInt(((a % self.1) + self.1) % self.1, self.1)
    }
    pub fn pow(self, n: i64) -> Self {
        if n < 0 {
            self.pow(-n).inv()
        } else if n == 0 {
            ModInt(1, self.1)
        } else if n == 1 {
            self
        } else {
            let mut x = (self * self).pow(n / 2);
            if n % 2 == 1 {
                x *= self
            }
            x
        }
    }
}
impl std::fmt::Display for ModInt {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}
impl std::ops::Neg for ModInt {
    type Output = Self;
    fn neg(self) -> Self {
        if self.0 == 0 {
            return self;
        }
        ModInt(self.1 - self.0, self.1)
    }
}
impl std::ops::Add<i64> for ModInt {
    type Output = Self;
    fn add(self, other: i64) -> Self {
        ModInt::new(self.0 + other, self.1)
    }
}
impl std::ops::Add for ModInt {
    type Output = Self;
    fn add(self, other: ModInt) -> Self {
        self + other.0
    }
}
impl std::ops::Add<ModInt> for i64 {
    type Output = ModInt;
    fn add(self, other: ModInt) -> ModInt {
        other + self
    }
}
impl std::ops::AddAssign<i64> for ModInt {
    fn add_assign(&mut self, other: i64) {
        self.0 = ModInt::new(self.0 + other, self.1).0;
    }
}
impl std::ops::AddAssign for ModInt {
    fn add_assign(&mut self, other: ModInt) {
        *self += other.0;
    }
}
impl std::ops::Sub<i64> for ModInt {
    type Output = Self;
    fn sub(self, other: i64) -> Self {
        ModInt::new(self.0 - other, self.1)
    }
}
impl std::ops::Sub for ModInt {
    type Output = Self;
    fn sub(self, other: ModInt) -> Self {
        self - other.0
    }
}
impl std::ops::Sub<ModInt> for i64 {
    type Output = ModInt;
    fn sub(self, other: ModInt) -> ModInt {
        ModInt::new(self - other.0, other.1)
    }
}
impl std::ops::SubAssign<i64> for ModInt {
    fn sub_assign(&mut self, other: i64) {
        self.0 = ModInt::new(self.0 - other, self.1).0;
    }
}
impl std::ops::SubAssign for ModInt {
    fn sub_assign(&mut self, other: ModInt) {
        *self -= other.0;
    }
}
impl std::ops::Mul<i64> for ModInt {
    type Output = Self;
    fn mul(self, other: i64) -> Self {
        ModInt::new(self.0 * other, self.1)
    }
}
impl std::ops::Mul for ModInt {
    type Output = Self;
    fn mul(self, other: ModInt) -> Self {
        self * other.0
    }
}
impl std::ops::Mul<ModInt> for i64 {
    type Output = ModInt;
    fn mul(self, other: ModInt) -> ModInt {
        other * self
    }
}
impl std::ops::MulAssign<i64> for ModInt {
    fn mul_assign(&mut self, other: i64) {
        self.0 = ModInt::new(self.0 * other, self.1).0;
    }
}
impl std::ops::MulAssign for ModInt {
    fn mul_assign(&mut self, other: ModInt) {
        *self *= other.0;
    }
}
impl std::ops::Div for ModInt {
    type Output = Self;
    fn div(self, other: ModInt) -> Self {
        self * other.inv()
    }
}
impl std::ops::Div<i64> for ModInt {
    type Output = Self;
    fn div(self, other: i64) -> Self {
        self / ModInt::new(other, self.1)
    }
}
impl std::ops::Div<ModInt> for i64 {
    type Output = ModInt;
    fn div(self, other: ModInt) -> ModInt {
        other.inv() * self
    }
}
impl std::ops::DivAssign for ModInt {
    fn div_assign(&mut self, other: ModInt) {
        self.0 = (self.clone() / other).0;
    }
}
impl std::ops::DivAssign<i64> for ModInt {
    fn div_assign(&mut self, other: i64) {
        *self /= ModInt(other, self.1);
    }
}

use std::collections::VecDeque;
use std::io::{self, Write};
use std::str::FromStr;

struct Scanner {
    stdin: io::Stdin,
    buffer: VecDeque<String>,
}
impl Scanner {
    fn new() -> Self {
        Scanner {
            stdin: io::stdin(),
            buffer: VecDeque::new(),
        }
    }
    fn cin<T: FromStr>(&mut self) -> T {
        while self.buffer.is_empty() {
            let mut line = String::new();
            let _ = self.stdin.read_line(&mut line);
            for w in line.split_whitespace() {
                self.buffer.push_back(String::from(w));
            }
        }
        self.buffer.pop_front().unwrap().parse::<T>().ok().unwrap()
    }
    fn chars(&mut self) -> Vec<char> {
        self.cin::<String>().chars().collect()
    }
    fn vec<T: FromStr>(&mut self, n: usize) -> Vec<T> {
        (0..n).map(|_| self.cin()).collect()
    }
}
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