結果

問題 No.1973 Divisor Sequence
ユーザー cutmdo
提出日時 2022-06-11 04:28:14
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 133 ms / 2,000 ms
コード長 3,600 bytes
コンパイル時間 13,093 ms
コンパイル使用メモリ 395,536 KB
実行使用メモリ 5,376 KB
最終ジャッジ日時 2024-09-21 11:59:23
合計ジャッジ時間 14,753 ms
ジャッジサーバーID
（参考情報） 		judge4 / 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 * 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: function `mul` is never used
  --> src/main.rs:24:4
   |
24 | fn mul(a: &Vec<Vec<i64>>, b: &Vec<Vec<i64>>, md: i64) -> Vec<Vec<i64>> {
   |    ^^^
   |
   = 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

use std::collections::HashMap;
use std::io::Write;
/* ----------------------------------------------- */
fn d(m: usize) -> Vec<usize> {
    let mut y = m;
    let mut v = Vec::<usize>::with_capacity(30);
    for x in 2..(m as f64).sqrt() as usize + 5 {
        if y % x == 0 {
            let mut c = 0;
            while y % x == 0 {
                y /= x;
                c += 1;
            }
            v.push(c);
        }
    }
    if y > 1 {
        v.push(1);
    }
    return v;
}
fn mul(a: &Vec<Vec<i64>>, b: &Vec<Vec<i64>>, md: i64) -> Vec<Vec<i64>> {
    let h = a.len();
    let w = b[0].len();
    let p = a[0].len();
    let mut ret = vec![vec![0; w]; h];
    for i in 0..h {
        for j in 0..w {
            for k in 0..p {
                ret[i][j] += (a[i][k] * b[k][j]) % md;
                if ret[i][j] >= md {
                    ret[i][j] -= md;
                }
            }
        }
    }
    return ret;
}
fn dp(n: usize, x: usize, md: i64) -> i64 {
    let mut cor = vec![1; x + 1];
    for _ in 0..n - 1 {
        let mut sum = cor.to_vec();
        for i in 1..sum.len() {
            sum[i] += sum[i - 1];
            sum[i] %= md;
        }
        for i in 0..sum.len() {
            cor[i] = sum[x - i];
        }
    }
    return cor.iter().sum::<i64>() % md;
}
fn run<W: Write>(sc: &mut scanner::Scanner, out: &mut std::io::BufWriter<W>) {
    let md: i64 = 1000000007;
    let n: usize = sc.next();
    let m: usize = sc.next();
    /*
    let mut mat = vec![vec![0; size]; size];
    for i in 0..size {
        for j in i..size {
            mat[i][j] = 1;
        }
    }
    let mut val = vec![vec![0; size]; size];
    for i in 0..size {
        val[i][i] = 1;
    }
    let mut k = n;
    while k > 0 {
        if k & 1 == 1 {
            val = mul(&val, &mat, md);
        }
        mat = mul(&mat, &mat, md);
        k >>= 1;
    }
    println!("{:?}", val);
    let cor: Vec<i64> = val
        .into_iter()
        .reduce(|ac, it| ac.into_iter().zip(it).map(|(a, b)| (a + b) % md).collect())
        .unwrap();
    */
    let mut ans = 1;
    let mut map = HashMap::<usize, i64>::new();
    for x in d(m) {
        let p = map.entry(x).or_insert(0);
        if *p == 0 {
            *p = dp(n, x, md);
        }
        ans *= *p;
        ans %= md;
    }
    writeln!(out, "{}", ans).ok();
}
/* ----------------------------------------------- */
#[allow(dead_code)]
mod scanner {
    use std::str::FromStr;
    pub struct Scanner<'a> {
        it: std::str::SplitWhitespace<'a>,
    }
    impl<'a> Scanner<'a> {
        pub fn new(s: &'a String) -> Scanner<'a> {
            Scanner {
                it: s.split_whitespace(),
            }
        }
        pub fn next<T: FromStr>(&mut self) -> T {
            self.it.next().unwrap().parse::<T>().ok().unwrap()
        }
        pub fn next_bytes(&mut self) -> Vec<u8> {
            self.it.next().unwrap().bytes().collect()
        }
        pub fn next_chars(&mut self) -> Vec<char> {
            self.it.next().unwrap().chars().collect()
        }
        pub fn next_vec<T: FromStr>(&mut self, len: usize) -> Vec<T> {
            (0..len).map(|_| self.next()).collect()
        }
    }
}
/* ----------------------------------------------- */
fn main() {
    use std::io::Read;
    let mut s = String::new();
    std::io::stdin().read_to_string(&mut s).unwrap();
    let mut sc = scanner::Scanner::new(&s);
    let out = std::io::stdout();
    let mut out = std::io::BufWriter::new(out.lock());
    run(&mut sc, &mut out);
}
/* ----------------------------------------------- */
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