結果

問題 No.954 Result
コンテスト
ユーザー alpha_virginis
提出日時 2019-12-16 20:39:54
言語 Rust
(1.83.0 + proconio)
結果
WA  
実行時間 -
コード長 5,313 bytes
コンパイル時間 14,173 ms
コンパイル使用メモリ 401,524 KB
実行使用メモリ 6,948 KB
最終ジャッジ日時 2024-07-02 20:29:20
合計ジャッジ時間 15,429 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge1
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 WA * 6
other AC * 6 WA * 23
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 import: `input_mcr::*`
   --> src/main.rs:162:5
    |
162 | use input_mcr::*;
    |     ^^^^^^^^^^^^
    |
    = note: `#[warn(unused_imports)]` on by default

warning: unused import: `std::cmp::*`
   --> src/main.rs:163:5
    |
163 | use std::cmp::*;
    |     ^^^^^^^^^^^

warning: struct `Parser` is never constructed
  --> src/main.rs:73:16
   |
73 |     pub struct Parser<R> {
   |                ^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: associated function `from_str` is never used
  --> src/main.rs:80:16
   |
79 |     impl Parser<io::Empty> {
   |     ---------------------- associated function in this implementation
80 |         pub fn from_str(s: &str) -> Parser<io::Empty> {
   |                ^^^^^^^^

warning: associated items `new`, `update_buf`, `next`, and `fast_i64` are never used
   --> src/main.rs:90:16
    |
89  |     impl<R: BufRead> Parser<R> {
    |     -------------------------- associated items in this implementation
90  |         pub fn new(reader: R) -> Parser<R> {
    |                ^^^
...
97  |         pub fn update_buf(&mut self) {
    |                ^^^^^^^^^^
...
113 |         pub fn next<T: str::FromStr>(&mut self) -> Result<T, T::Err> {
    |                ^^^^
...
131 |         pub fn fast_i64(&mut self) -> i64 {
    |                ^^^^^^^^

warning: unused `Result` that must be used
   --> src/main.rs:169:5
    |
169 |     stdin.read_to_string(&mut t);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled
    = note: `#[warn(unused_must_use)]` on by default
help: use `let _ = ...` to ignore the resulting value
    |
169 |     let _ = stdin.read_to_string(&mut t);
    |     +++++++

ソースコード

diff # 

#[macro_use]
mod input_mcr {
    // ref: tanakh <https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8>
    // diff: using Parser
    #[macro_export(local_inner_macros)]
    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_export(local_inner_macros)]
    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_export(local_inner_macros)]
    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, char_) => {
        read_value!($parser, String).chars().collect::<Vec<char>>()[0]
    };
    ($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();
                }
            }
        }
    }
}

use input_mcr::*;
use std::cmp::*;
use std::io::Read;

fn main() {
    let mut stdin = std::io::stdin();
    let mut t = String::new();
    stdin.read_to_string(&mut t);
    assert!(t.chars().filter(|&x| x == '\n').count() == 5);
    println!("0");
}
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