結果

問題 No.2176 LRM Question 1
ユーザー tonyu0tonyu0
提出日時 2023-01-06 22:10:27
言語 Rust
(1.77.0 + proconio)
結果
AC  
実行時間 44 ms / 2,000 ms
コード長 5,072 bytes
コンパイル時間 16,485 ms
コンパイル使用メモリ 378,120 KB
実行使用メモリ 17,664 KB
最終ジャッジ日時 2024-05-07 21:45:17
合計ジャッジ時間 12,681 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge3
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 1 ms
5,248 KB
testcase_01 AC 1 ms
5,376 KB
testcase_02 AC 39 ms
17,524 KB
testcase_03 AC 1 ms
5,376 KB
testcase_04 AC 29 ms
17,664 KB
testcase_05 AC 2 ms
5,376 KB
testcase_06 AC 1 ms
5,376 KB
testcase_07 AC 2 ms
5,376 KB
testcase_08 AC 28 ms
17,664 KB
testcase_09 AC 26 ms
17,152 KB
testcase_10 AC 31 ms
15,096 KB
testcase_11 AC 1 ms
5,376 KB
testcase_12 AC 1 ms
5,376 KB
testcase_13 AC 27 ms
17,536 KB
testcase_14 AC 44 ms
17,600 KB
testcase_15 AC 30 ms
14,336 KB
testcase_16 AC 24 ms
11,996 KB
testcase_17 AC 2 ms
5,376 KB
testcase_18 AC 24 ms
16,000 KB
testcase_19 AC 17 ms
11,520 KB
testcase_20 AC 7 ms
5,376 KB
testcase_21 AC 16 ms
8,192 KB
testcase_22 AC 2 ms
5,376 KB
testcase_23 AC 14 ms
7,424 KB
testcase_24 AC 13 ms
8,576 KB
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ソースコード

diff # 

#![allow(dead_code, unused_imports, unused_macros)]
use std::{
    cell::UnsafeCell,
    cmp::{max, min},
    io::{BufWriter, Read, Stdin, Stdout, Write},
    str::FromStr,
};

fn main() {
    let a = read_vec::<usize>(3);
    let l = a[0];
    let r = a[1];
    let m = a[2];
    let mut cum = vec![1usize; m];
    let mut fac = vec![1usize; m];
    for i in 1..m {
        fac[i] = fac[i - 1] * i % m;
    }
    for i in 1..m {
        cum[i] = cum[i - 1] * fac[i] % m;
    }
    let mut ans = 0usize;
    for i in l..min(m, r + 1) {
        ans = (ans + cum[i]) % m;
    }
    println!("{}", ans);
    out_flush();
}

const IO_BUF_SIZE: usize = 1 << 16;
type Input = Scanner<Stdin>;
type Output = BufWriter<Stdout>;
fn _init_input() -> Input {
    Scanner::new(std::io::stdin())
}
fn _init_output() -> Output {
    BufWriter::with_capacity(IO_BUF_SIZE, std::io::stdout())
}

#[repr(transparent)]
struct Unsync<T>(T);
unsafe impl<T> Sync for Unsync<T> {}

type BadLazy<T> = Unsync<UnsafeCell<Option<T>>>;
impl<T> BadLazy<T> {
    const fn new() -> Self {
        Self(UnsafeCell::new(None))
    }
}

static INPUT: BadLazy<Input> = BadLazy::new();
static OUTPUT: BadLazy<Output> = BadLazy::new();

fn inp<F: FnOnce(&mut Input) -> R, R>(f: F) -> R {
    unsafe { f((&mut *INPUT.0.get()).get_or_insert_with(_init_input)) }
}
fn out<F: FnOnce(&mut Output) -> R, R>(f: F) -> R {
    unsafe { f((&mut *OUTPUT.0.get()).get_or_insert_with(_init_output)) }
}

#[macro_export]
macro_rules! read {
    () => { read() };
    ($t: ty) => { read::<$t>() };
    ($t: ty, $($tt: ty),*) => { (read::<$t>(), $(read::<$tt>(),)*) };
    [$t: ty; $n: expr] => { read_vec::<$t>($n) };
}
#[macro_export]
macro_rules! println {
    () => { out(|x| { let _ = writeln!(x); }) };
    ($exp: expr) => { out(|x| { let _ = writeln!(x, "{}", $exp); }) };
    ($fmt: expr, $($arg : tt )*) => { out(|x| { let _ = writeln!(x, $fmt, $($arg)*); }) }
}
#[macro_export]
macro_rules! print {
    ($exp: expr) => { out(|x| { let _ = write!(x, "{}", $exp); }) };
    ($fmt: expr, $($arg : tt )*) => { out(|x| { let _ = write!(x, $fmt, $($arg)*); }) }
}

fn out_flush() {
    out(|x| {
        let _ = x.flush();
    });
}

fn input_is_eof() -> bool {
    inp(|x| x.eof())
}
fn read_byte() -> u8 {
    inp(|x| x.byte())
}
fn read_bytes_no_skip(n: usize) -> Vec<u8> {
    inp(|x| x.bytes_no_skip(n))
}
fn read_bytes(n: usize) -> Vec<u8> {
    inp(|x| x.bytes(n))
}
fn read_bytes2(n: usize, m: usize) -> Vec<Vec<u8>> {
    inp(|x| x.bytes2(n, m))
}
fn read_token() -> Vec<u8> {
    inp(|x| x.token_bytes())
}
fn read_token_str() -> String {
    unsafe { String::from_utf8_unchecked(read_token()) }
}
fn read_line() -> Vec<u8> {
    inp(|x| x.line_bytes())
}
fn read_line_str() -> String {
    unsafe { String::from_utf8_unchecked(read_line()) }
}
fn read<T: FromStr>() -> T {
    read_token_str().parse::<T>().ok().expect("failed parse")
}
fn read_vec<T: FromStr>(n: usize) -> Vec<T> {
    (0..n).map(|_| read()).collect()
}
fn read_vec2<T: FromStr>(n: usize, m: usize) -> Vec<Vec<T>> {
    (0..n).map(|_| read_vec(m)).collect()
}

struct Scanner<R: Read> {
    src: R,
    _buf: Vec<u8>,
    _pt: usize, // pointer
    _rd: usize, // bytes read
}

#[allow(dead_code)]
impl<R: Read> Scanner<R> {
    fn new(src: R) -> Scanner<R> {
        Scanner {
            src,
            _buf: vec![0; IO_BUF_SIZE],
            _pt: 1,
            _rd: 1,
        }
    }

    fn _check_buf(&mut self) {
        if self._pt == self._rd {
            self._rd = self.src.read(&mut self._buf).unwrap_or(0);
            self._pt = (self._rd == 0) as usize;
        }
    }

    // returns true if end of file
    fn eof(&mut self) -> bool {
        self._check_buf();
        self._rd == 0
    }

    // filters \r, returns \0 if eof
    fn byte(&mut self) -> u8 {
        loop {
            self._check_buf();
            if self._rd == 0 {
                return 0;
            }
            let res = self._buf[self._pt];
            self._pt += 1;
            if res != b'\r' {
                return res;
            }
        }
    }

    fn bytes_no_skip(&mut self, n: usize) -> Vec<u8> {
        (0..n).map(|_| self.byte()).collect()
    }
    fn bytes(&mut self, n: usize) -> Vec<u8> {
        let res = self.bytes_no_skip(n);
        self.byte();
        res
    }
    fn bytes2(&mut self, n: usize, m: usize) -> Vec<Vec<u8>> {
        (0..n).map(|_| self.bytes(m)).collect()
    }

    fn token_bytes(&mut self) -> Vec<u8> {
        let mut res = Vec::new();
        let mut c = self.byte();
        while c <= b' ' {
            if c == b'\0' {
                return res;
            }
            c = self.byte();
        }
        loop {
            res.push(c);
            c = self.byte();
            if c <= b' ' {
                return res;
            }
        }
    }

    fn line_bytes(&mut self) -> Vec<u8> {
        let mut res = Vec::new();
        let mut c = self.byte();
        while c != b'\n' && c != b'\0' {
            res.push(c);
            c = self.byte();
        }
        res
    }
}
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