結果

問題 No.1973 Divisor Sequence
ユーザー fukafukatani
提出日時 2022-06-18 09:45:33
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 12 ms / 2,000 ms
コード長 8,181 bytes
コンパイル時間 13,795 ms
コンパイル使用メモリ 378,460 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-10-09 20:44:43
合計ジャッジ時間 13,831 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge5
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 * 3
other AC * 22
権限があれば一括ダウンロードができます
コンパイルメッセージ
warning: type `mat` should have an upper camel case name
   --> src/main.rs:100:6
    |
100 | type mat = Vec<Vec<Modulo>>;
    |      ^^^ help: convert the identifier to upper camel case: `Mat`
    |
    = note: `#[warn(non_camel_case_types)]` on by default

warning: associated items `set_modulus`, `pow`, and `inv` are never used
   --> src/main.rs:139:8
    |
138 | impl Modulo {
    | ----------- associated items in this implementation
139 |     fn set_modulus(m: i64) {
    |        ^^^^^^^^^^^
...
157 |     fn pow(self, p: i64) -> Modulo {
    |        ^^^
...
169 |     fn inv(self) -> Modulo {
    |        ^^^
    |
    = note: `#[warn(dead_code)]` on by default

ソースコード

diff #
プレゼンテーションモードにする

#![allow(unused_imports)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;
use std::ops::Bound::*;
#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}
fn main() {
    let v = read_vec::<i64>();
    let (n, m) = (v[0], v[1]);
    let mut ans = Modulo(1);
    let mut root_n = 0;
    for i in 1.. {
        if i * i > m {
            root_n = i;
            break;
        }
    }
    let primes = get_primes(root_n);
    let mut mm = m;
    let mut p_dividors = vec![];
    for &p in &primes {
        if mm % p == 0 {
            p_dividors.push(p);
        }
        while mm % p == 0 {
            mm /= p;
        }
    }
    if mm != 1 {
        p_dividors.push(mm);
    }
    for p in p_dividors {
        let mut dividors = vec![];
        let mut coef = 1;
        while m % coef == 0 {
            dividors.push(coef);
            coef *= p;
        }
        let mut cross = vec![vec![Modulo(0); dividors.len()]; dividors.len()];
        for (i, &d1) in dividors.iter().enumerate() {
            for (j, &d2) in dividors.iter().enumerate() {
                if m as i128 % (d1 as i128 * d2 as i128) == 0 {
                    cross[i][j] = Modulo(1);
                }
            }
        }
        let a = matpow(&cross, n as u64);
        ans *= a[0].iter().sum::<Modulo>();
    }
    println!("{}", ans);
}
fn get_primes(n: i64) -> Vec<i64> {
    let mut is_prime = vec![true; n as usize + 1];
    let mut primes = Vec::new();
    is_prime[0] = false;
    is_prime[1] = false;
    for i in 2..n + 1 {
        if is_prime[i as usize] {
            primes.push(i);
            let mut j = 2 * i;
            while j <= n {
                is_prime[j as usize] = false;
                j += i;
            }
        }
    }
    primes
}
fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}
fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}
type mat = Vec<Vec<Modulo>>;
fn mat_zeros(n: usize, m: usize) -> mat {
    vec![vec![Modulo(0); m]; n]
}
fn matmul(a: &mat, b: &mat) -> mat {
    let mut c = mat_zeros(a.len(), b[0].len());
    for i in 0..a.len() {
        for k in 0..b.len() {
            for j in 0..b[0].len() {
                c[i][j] += a[i][k] * b[k][j];
            }
        }
    }
    c
}
fn matpow(a: &mat, n: u64) -> mat {
    let mut b = mat_zeros(a.len(), a.len());
    for i in 0..a.len() {
        b[i][i] = Modulo(1);
    }
    let mut n = n;
    let mut a: mat = a.clone();
    while n > 0 {
        if n & 1 == 1 {
            b = matmul(&a, &b);
        }
        a = matmul(&a, &a);
        n >>= 1;
    }
    b
}
#[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
struct Modulo(i64);
static mut MODULUS: i64 = 1000_000_000 + 7;
impl Modulo {
    fn set_modulus(m: i64) {
        unsafe {
            MODULUS = m;
        }
    }
    fn get_modulus() -> i64 {
        unsafe { MODULUS }
    }
    fn new(x: i64) -> Modulo {
        let m = Modulo::get_modulus();
        if x < 0 {
            Modulo(x % m + m)
        } else if x < m {
            Modulo(x)
        } else {
            Modulo(x % m)
        }
    }
    fn pow(self, p: i64) -> Modulo {
        if p == 0 {
            Modulo(1)
        } else {
            let mut t = self.pow(p / 2);
            t *= t;
            if p & 1 == 1 {
                t *= self;
            }
            t
        }
    }
    fn inv(self) -> Modulo {
        self.pow(Modulo::get_modulus() - 2)
    }
}
impl std::fmt::Display for Modulo {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        self.0.fmt(f)
    }
}
impl std::ops::AddAssign for Modulo {
    fn add_assign(&mut self, other: Modulo) {
        let m = Modulo::get_modulus();
        self.0 += other.0;
        if self.0 >= m {
            self.0 -= m;
        }
    }
}
impl std::ops::MulAssign for Modulo {
    fn mul_assign(&mut self, other: Modulo) {
        let m = Modulo::get_modulus();
        self.0 *= other.0;
        self.0 %= m;
    }
}
impl std::ops::SubAssign for Modulo {
    fn sub_assign(&mut self, other: Modulo) {
        let m = Modulo::get_modulus();
        self.0 += m - other.0;
        if self.0 >= m {
            self.0 -= m;
        }
    }
}
macro_rules! impl_modulo_ops {
    ($imp:ident, $method:ident, $assign_imp:ident, $assign_method:ident) => {
        impl<'a> std::ops::$assign_imp<&'a Modulo> for Modulo {
            fn $assign_method(&mut self, other: &'a Modulo) {
                std::ops::$assign_imp::$assign_method(self, *other);
            }
        }
        impl std::ops::$imp for Modulo {
            type Output = Modulo;
            fn $method(self, other: Modulo) -> Modulo {
                let mut x = self;
                std::ops::$assign_imp::$assign_method(&mut x, other);
                x
            }
        }
        impl<'a> std::ops::$imp<Modulo> for &'a Modulo {
            type Output = Modulo;
            fn $method(self, other: Modulo) -> Modulo {
                std::ops::$imp::$method(*self, other)
            }
        }
        impl<'a> std::ops::$imp<&'a Modulo> for Modulo {
            type Output = Modulo;
            fn $method(self, other: &'a Modulo) -> Modulo {
                std::ops::$imp::$method(self, *other)
            }
        }
        impl<'a, 'b> std::ops::$imp<&'b Modulo> for &'a Modulo {
            type Output = Modulo;
            fn $method(self, other: &'b Modulo) -> Modulo {
                std::ops::$imp::$method(*self, *other)
            }
        }
        impl std::ops::$assign_imp<i64> for Modulo {
            fn $assign_method(&mut self, other: i64) {
                std::ops::$assign_imp::$assign_method(self, Modulo::new(other));
            }
        }
        impl<'a> std::ops::$assign_imp<&'a i64> for Modulo {
            fn $assign_method(&mut self, other: &'a i64) {
                std::ops::$assign_imp::$assign_method(self, *other);
            }
        }
        impl std::ops::$imp<i64> for Modulo {
            type Output = Modulo;
            fn $method(self, other: i64) -> Modulo {
                let mut x = self;
                std::ops::$assign_imp::$assign_method(&mut x, other);
                x
            }
        }
        impl<'a> std::ops::$imp<&'a i64> for Modulo {
            type Output = Modulo;
            fn $method(self, other: &'a i64) -> Modulo {
                std::ops::$imp::$method(self, *other)
            }
        }
        impl<'a> std::ops::$imp<i64> for &'a Modulo {
            type Output = Modulo;
            fn $method(self, other: i64) -> Modulo {
                std::ops::$imp::$method(*self, other)
            }
        }
        impl<'a, 'b> std::ops::$imp<&'b i64> for &'a Modulo {
            type Output = Modulo;
            fn $method(self, other: &'b i64) -> Modulo {
                std::ops::$imp::$method(*self, *other)
            }
        }
    };
}
impl_modulo_ops!(Add, add, AddAssign, add_assign);
impl_modulo_ops!(Mul, mul, MulAssign, mul_assign);
impl_modulo_ops!(Sub, sub, SubAssign, sub_assign);
use std::iter::Sum;
impl Sum for Modulo {
    fn sum<I>(iter: I) -> Self
    where
        I: Iterator<Item = Modulo>,
    {
        iter.fold(Modulo(0), |a, b| a + b)
    }
}
impl<'a> Sum<&'a Modulo> for Modulo {
    fn sum<I>(iter: I) -> Self
    where
        I: Iterator<Item = &'a Self>,
    {
        iter.fold(Modulo(0), |a, b| a + b)
    }
}
use std::iter::Product;
impl Product for Modulo {
    fn product<I>(iter: I) -> Self
    where
        I: Iterator<Item = Modulo>,
    {
        iter.fold(Modulo(1), |a, b| a * b)
    }
}
impl<'a> Product<&'a Modulo> for Modulo {
    fn product<I>(iter: I) -> Self
    where
        I: Iterator<Item = &'a Self>,
    {
        iter.fold(Modulo(1), |a, b| a * b)
    }
}
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