#323282 (Rust) No.797 Noelちゃんとピラミッド

提出ソース

結果

問題	No.797 Noelちゃんとピラミッド
ユーザー	alpha_virginis
提出日時	2019-03-15 21:47:23
言語	Rust (1.77.0 + proconio)
結果	AC
実行時間	33 ms / 2,000 ms
コード長	8,500 bytes
コンパイル時間	14,131 ms
コンパイル使用メモリ	380,512 KB
実行使用メモリ	5,376 KB
最終ジャッジ日時	2024-07-01 20:44:52
合計ジャッジ時間	16,294 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
（要ログイン）

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 5,248 KB
testcase_02	AC	1 ms 5,376 KB
testcase_03	AC	32 ms 5,376 KB
testcase_04	AC	33 ms 5,376 KB
testcase_05	AC	32 ms 5,376 KB
testcase_06	AC	32 ms 5,376 KB
testcase_07	AC	32 ms 5,376 KB
testcase_08	AC	32 ms 5,376 KB
testcase_09	AC	32 ms 5,376 KB
testcase_10	AC	32 ms 5,376 KB
testcase_11	AC	33 ms 5,376 KB
testcase_12	AC	32 ms 5,376 KB
testcase_13	AC	32 ms 5,376 KB
testcase_14	AC	32 ms 5,376 KB
testcase_15	AC	32 ms 5,376 KB
testcase_16	AC	32 ms 5,376 KB
testcase_17	AC	32 ms 5,376 KB
testcase_18	AC	32 ms 5,376 KB
testcase_19	AC	32 ms 5,376 KB
testcase_20	AC	32 ms 5,376 KB
testcase_21	AC	32 ms 5,376 KB
testcase_22	AC	32 ms 5,376 KB
testcase_23	AC	23 ms 5,376 KB
testcase_24	AC	8 ms 5,376 KB
testcase_25	AC	20 ms 5,376 KB
testcase_26	AC	19 ms 5,376 KB
testcase_27	AC	31 ms 5,376 KB
testcase_28	AC	29 ms 5,376 KB
testcase_29	AC	5 ms 5,376 KB
testcase_30	AC	8 ms 5,376 KB
testcase_31	AC	23 ms 5,376 KB
testcase_32	AC	10 ms 5,376 KB
testcase_33	AC	19 ms 5,376 KB
testcase_34	AC	14 ms 5,376 KB
testcase_35	AC	32 ms 5,376 KB
testcase_36	AC	4 ms 5,376 KB
testcase_37	AC	28 ms 5,376 KB
testcase_38	AC	29 ms 5,376 KB
testcase_39	AC	19 ms 5,376 KB
testcase_40	AC	4 ms 5,376 KB
testcase_41	AC	6 ms 5,376 KB
testcase_42	AC	18 ms 5,376 KB
testcase_43	AC	1 ms 5,376 KB
testcase_44	AC	1 ms 5,376 KB
testcase_45	AC	1 ms 5,376 KB
testcase_46	AC	1 ms 5,376 KB
testcase_47	AC	1 ms 5,376 KB
testcase_48	AC	1 ms 5,376 KB
testcase_49	AC	1 ms 5,376 KB
testcase_50	AC	2 ms 5,376 KB
testcase_51	AC	1 ms 5,376 KB
testcase_52	AC	1 ms 5,376 KB
testcase_53	AC	1 ms 5,376 KB
testcase_54	AC	1 ms 5,376 KB
testcase_55	AC	1 ms 5,376 KB
testcase_56	AC	1 ms 5,376 KB
testcase_57	AC	1 ms 5,376 KB
testcase_58	AC	1 ms 5,376 KB
testcase_59	AC	1 ms 5,376 KB
testcase_60	AC	1 ms 5,376 KB
testcase_61	AC	1 ms 5,376 KB
testcase_62	AC	1 ms 5,376 KB

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: unused `Result` that must be used
   --> src/main.rs:316:5
    |
316 |     writeln!(buf, "{}", res.as_u64());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled
    = note: `#[warn(unused_must_use)]` on by default
    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)

ソースコード

raw source code

/*------------------------------------------------------------------*/
/*------------------------- begin template -------------------------*/
/*------------------------------------------------------------------*/

// ref: tanakh <https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8>
// diff: using Parser
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut parser = Parser::from_str($s);
        input_inner!{parser, $($r)*}
    };
    (parser = $parser:ident, $($r:tt)*) => {
        input_inner!{$parser, $($r)*}
    };
    (new_stdin_parser = $parser:ident, $($r:tt)*) => {
        let stdin = std::io::stdin();
        let reader = std::io::BufReader::new(stdin.lock());
        let mut $parser = Parser::new(reader);
        input_inner!{$parser, $($r)*}
    };
    ($($r:tt)*) => {
        input!{new_stdin_parser = parser, $($r)*}
    };
}

macro_rules! input_inner {
    ($parser:ident) => {};
    ($parser:ident, ) => {};
    ($parser:ident, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($parser, $t);
        input_inner!{$parser $($r)*}
    };
}

macro_rules! read_value {
    ($parser:ident, ( $($t:tt),* )) => {
        ( $(read_value!($parser, $t)),* )
    };
    ($parser:ident, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($parser, $t)).collect::<Vec<_>>()
    };
    ($parser:ident, chars) => {
        read_value!($parser, String).chars().collect::<Vec<char>>()
    };
    ($parser:ident, usize1) => {
        read_value!($parser, usize) - 1
    };
    ($parser:ident, i64_) => {
        $parser.fast_i64()
    };
    ($parser:ident, usize_) => {
        $parser.fast_i64() as usize
    };
    ($parser:ident, usize1_) => {
        ($parser.fast_i64() - 1) as usize
    };
    ($parser:ident, $t:ty) => {
        $parser.next::<$t>().expect("Parse error")
    };
}

use std::io;
use std::io::BufRead;
use std::str;

// ref: tatsuya6502 <https://qiita.com/tatsuya6502/items/cd448486f7ef7b5b8c7e>
// ref: wariuni <https://qiita.com/tatsuya6502/items/cd448486f7ef7b5b8c7e#comment-7040a5ae96305e884eb9>
// diff: using std::io::BufRead::fill_buf()
pub struct Parser<R> {
    pub reader: R,
    buf: Vec<u8>,
    pos: usize,
}

impl Parser<io::Empty> {
    pub fn from_str(s: &str) -> Parser<io::Empty> {
        Parser {
            reader: io::empty(),
            buf: s.as_bytes().to_vec(),
            pos: 0,
        }
    }
}

impl<R: BufRead> Parser<R> {
    pub fn new(reader: R) -> Parser<R> {
        Parser {
            reader: reader,
            buf: vec![],
            pos: 0,
        }
    }
    pub fn update_buf(&mut self) {
        self.buf.clear();
        self.pos = 0;
        loop {
            let (len, complete) = {
                let buf2 = self.reader.fill_buf().unwrap();
                self.buf.extend_from_slice(buf2);
                let len = buf2.len();
                (len, buf2[len - 1] <= 0x20)
            };
            self.reader.consume(len);
            if complete {
                break;
            }
        }
    }
    pub fn next<T: str::FromStr>(&mut self) -> Result<T, T::Err> {
        loop {
            let mut begin = self.pos;
            while begin < self.buf.len() && (self.buf[begin] <= 0x20) {
                begin += 1;
            }
            let mut end = begin;
            while end < self.buf.len() && (self.buf[end] > 0x20) {
                end += 1;
            }
            if begin != self.buf.len() {
                self.pos = end;
                return unsafe { str::from_utf8_unchecked(&self.buf[begin..end]) }.parse::<T>();
            } else {
                self.update_buf();
            }
        }
    }
    pub fn fast_i64(&mut self) -> i64 {
        loop {
            let mut begin = self.pos;
            while begin < self.buf.len() && (self.buf[begin] <= 0x20) {
                begin += 1;
            }
            if begin == self.buf.len() {
                self.update_buf();
                continue;
            }
            let mut res = 0;
            let (is_positive, mut end) = match self.buf[begin] {
                b'+' => (true, begin + 1),
                b'-' => (false, begin + 1),
                _ => (true, begin),
            };
            while end < self.buf.len() && (self.buf[end] > 0x20) {
                res = res * 10 + (self.buf[end] as i64 - '0' as i64);
                end += 1;
            }
            if begin != self.buf.len() {
                self.pos = end;
                return if is_positive { res } else { -res };
            } else {
                self.update_buf();
            }
        }
    }
}

#[allow(unused_imports)]
use std::cmp::*;
use std::marker::PhantomData;
use std::ops::*;

pub trait ModP {
    fn as_u64() -> u64;
}

#[allow(non_camel_case_types)]
#[derive(Clone, Copy, Debug)]
pub struct Mod_1_000_000_007();
impl ModP for Mod_1_000_000_007 {
    fn as_u64() -> u64 {
        1_000_000_007
    }
}

#[allow(non_camel_case_types)]
#[derive(Clone, Copy, Debug)]
pub struct Mod_998_244_353();
impl ModP for Mod_998_244_353 {
    fn as_u64() -> u64 {
        998_244_353
    }
}

#[derive(Clone, Copy, PartialEq, Debug)]
pub struct Modular<P: ModP + Copy>(u64, PhantomData<P>);

impl<P: ModP + Copy> Modular<P> {
    pub fn new(x: u64) -> Modular<P> {
        Modular(x % P::as_u64(), PhantomData)
    }
    pub fn pow(self, n: u64) -> Modular<P> {
        if n == 0 {
            return Modular(1, PhantomData);
        }
        let t = self.pow(n / 2);
        if n % 2 == 0 {
            t * t
        } else {
            t * t * self
        }
    }
    pub fn as_u64(self) -> u64 {
        self.0
    }
}

impl<P: ModP + Copy> Add for Modular<P> {
    type Output = Self;
    fn add(self, rhs: Self) -> Self::Output {
        Modular((self.0 + rhs.0) % P::as_u64(), PhantomData)
    }
}

impl<P: ModP + Copy> AddAssign for Modular<P> {
    fn add_assign(&mut self, rhs: Self) {
        *self = *self + rhs;
    }
}

impl<P: ModP + Copy> Sub for Modular<P> {
    type Output = Self;
    fn sub(self, rhs: Self) -> Self::Output {
        Modular(
            (self.0 + P::as_u64() - rhs.0 % P::as_u64()) % P::as_u64(),
            PhantomData,
        )
    }
}

impl<P: ModP + Copy> SubAssign for Modular<P> {
    fn sub_assign(&mut self, rhs: Self) {
        *self = *self - rhs;
    }
}

impl<P: ModP + Copy> Neg for Modular<P> {
    type Output = Modular<P>;
    fn neg(self) -> Modular<P> {
        Modular(P::as_u64() - self.0, PhantomData)
    }
}

impl<P: ModP + Copy> Mul for Modular<P> {
    type Output = Self;
    fn mul(self, rhs: Self) -> Self::Output {
        Modular(
            (self.0 % P::as_u64()) * (rhs.0 % P::as_u64()) % P::as_u64(),
            PhantomData,
        )
    }
}

impl<P: ModP + Copy> MulAssign for Modular<P> {
    fn mul_assign(&mut self, rhs: Self) {
        *self = *self * rhs;
    }
}

impl<P: ModP + Copy> Div for Modular<P> {
    type Output = Self;
    fn div(self, rhs: Self) -> Self::Output {
        if rhs.0 == 0 {
            loop {}
        }
        assert!(rhs.0 != 0);
        self * rhs.pow(P::as_u64() - 2)
    }
}

pub fn gen_fact_table<P: ModP + Copy>(n: usize) -> Vec<Modular<P>> {
    let mut res = vec![Modular::<P>::new(1); n + 1];
    for i in 0..n {
        res[i + 1] = res[i] * Modular::<P>::new((i + 1) as u64);
    }
    res
}

pub fn gen_inv_table<P: ModP + Copy>(n: usize) -> Vec<Modular<P>> {
    let mut res = vec![Modular::<P>::new(0); n + 1];
    res[1] = Modular::<P>::new(1);
    for i in 2..n + 1 {
        res[i] = -res[P::as_u64() as usize % i] * Modular::<P>::new(P::as_u64() / i as u64);
    }
    res
}

fn main() {
    input! {
        new_stdin_parser = parser,
    }
    let res = solve(&mut parser);
    print!("{}", res);
}

/*------------------------------------------------------------------*/
/*-------------------------- end template --------------------------*/
/*------------------------------------------------------------------*/

type Mod = Modular<Mod_1_000_000_007>;

use std::fmt::Write;
fn solve<R: BufRead>(parser: &mut Parser<R>) -> String {
    let mut buf = String::new();
    input! {
        parser = parser,
        n: usize,
        xs: [u64; n],
    }
    let fact = gen_fact_table(n + 1);
    let mut res = Mod::new(0);
    for i in 0..n {
        let a = fact[n - 1] / (fact[i] * fact[n - 1 - i]);
        // eprintln!("i = {}, a = {:?}", i, a);
        res += a * Mod::new(xs[i]);
    }
    writeln!(buf, "{}", res.as_u64());
    buf
}

yukicoder

結果

テストケース

コンパイルメッセージ

ソースコード