結果

問題 No.2350 Four Seasons
コンテスト
ユーザー naut3
提出日時 2023-06-18 01:57:18
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 1 ms / 2,000 ms
コード長 1,469 bytes
コンパイル時間 18,362 ms
コンパイル使用メモリ 380,032 KB
実行使用メモリ 5,376 KB
最終ジャッジ日時 2024-06-25 14:23:38
合計ジャッジ時間 18,757 ms
ジャッジサーバーID
（参考情報） 		judge1 / 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 * 2
other AC * 10
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:19:9
   |
19 |         writeln!(out, "spring");
   |         ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = 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)

warning: unused `Result` that must be used
  --> src/main.rs:21:9
   |
21 |         writeln!(out, "summer");
   |         ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled
   = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: unused `Result` that must be used
  --> src/main.rs:23:9
   |
23 |         writeln!(out, "fall");
   |         ^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled
   = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: unused `Result` that must be used
  --> src/main.rs:25:9
   |
25 |         writeln!(out, "winter");
   |         ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled
   = 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

diff # 

#![allow(non_snake_case, unused_imports)]
use std::io::{self, prelude::*};
use std::str;

fn main() {
    let (stdin, stdout) = (io::stdin(), io::stdout());
    let mut scan = Scanner::new(stdin.lock());
    let mut out = io::BufWriter::new(stdout.lock());

    macro_rules! input {
        ($T: ty) => {
            scan.token::<$T>()
        };
    }

    let X = input!(usize);

    if 3 <= X && X <= 5 {
        writeln!(out, "spring");
    } else if 6 <= X && X <= 8 {
        writeln!(out, "summer");
    } else if 9 <= X && X <= 11 {
        writeln!(out, "fall");
    } else {
        writeln!(out, "winter");
    }
}

struct Scanner<R> {
    reader: R,
    buf_str: Vec<u8>,
    buf_iter: str::SplitWhitespace<'static>,
}
impl<R: BufRead> Scanner<R> {
    fn new(reader: R) -> Self {
        Self {
            reader,
            buf_str: vec![],
            buf_iter: "".split_whitespace(),
        }
    }
    fn token<T: str::FromStr>(&mut self) -> T {
        loop {
            if let Some(token) = self.buf_iter.next() {
                return token.parse().ok().expect("Failed parse");
            }
            self.buf_str.clear();
            self.reader
                .read_until(b'\n', &mut self.buf_str)
                .expect("Failed read");
            self.buf_iter = unsafe {
                let slice = str::from_utf8_unchecked(&self.buf_str);
                std::mem::transmute(slice.split_whitespace())
            }
        }
    }
}
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