結果

問題 No.2681 ゲームセンターの両替
ユーザー nautnaut
提出日時 2024-03-20 21:18:29
言語 Rust
(1.77.0)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 1,998 bytes
コンパイル時間 5,405 ms
コンパイル使用メモリ 162,448 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-04-15 10:12:03
合計ジャッジ時間 6,164 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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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
6,812 KB
testcase_01 AC 1 ms
6,944 KB
testcase_02 AC 1 ms
6,940 KB
testcase_03 AC 1 ms
6,944 KB
testcase_04 AC 1 ms
6,944 KB
testcase_05 AC 1 ms
6,944 KB
testcase_06 AC 1 ms
6,940 KB
testcase_07 AC 1 ms
6,944 KB
testcase_08 AC 1 ms
6,940 KB
testcase_09 AC 1 ms
6,944 KB
testcase_10 AC 1 ms
6,940 KB
testcase_11 AC 1 ms
6,944 KB
testcase_12 AC 1 ms
6,944 KB
testcase_13 AC 1 ms
6,940 KB
testcase_14 AC 1 ms
6,944 KB
testcase_15 AC 1 ms
6,944 KB
testcase_16 AC 1 ms
6,944 KB
testcase_17 AC 1 ms
6,944 KB
testcase_18 AC 1 ms
6,940 KB
testcase_19 AC 1 ms
6,940 KB
testcase_20 AC 1 ms
6,944 KB
testcase_21 AC 1 ms
6,940 KB
testcase_22 AC 1 ms
6,940 KB
testcase_23 AC 1 ms
6,944 KB
testcase_24 AC 1 ms
6,940 KB
testcase_25 AC 2 ms
6,940 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: value assigned to `Y` is never read
  --> main.rs:39:5
   |
39 |     Y -= 100 * c100;
   |     ^
   |
   = help: maybe it is overwritten before being read?
   = note: `#[warn(unused_assignments)]` on by default

warning: variable does not need to be mutable
  --> main.rs:28:9
   |
28 |     let mut c10000 = Y / 10000;
   |         ----^^^^^^
   |         |
   |         help: remove this `mut`
   |
   = note: `#[warn(unused_mut)]` on by default

warning: variable does not need to be mutable
  --> main.rs:30:9
   |
30 |     let mut c5000 = Y / 5000;
   |         ----^^^^^
   |         |
   |         help: remove this `mut`

warning: variable does not need to be mutable
  --> main.rs:32:9
   |
32 |     let mut c2000 = Y / 2000;
   |         ----^^^^^
   |         |
   |         help: remove this `mut`

warning: variable does not need to be mutable
  --> main.rs:34:9
   |
34 |     let mut c1000 = Y / 1000;
   |         ----^^^^^
   |         |
   |         help: remove this `mut`

warning: variable does not need to be mutable
  --> main.rs:36:9
   |
36 |     let mut c500 = Y / 500;
   |         ----^^^^
   |         |
   |         help: remove this `mut`

warning: variable does not need to be mutable
  --> main.rs:38:9
   |
38 |     let mut c100 = Y / 100;
   |         ----^^^^
   |         |
   |         help: remove this `mut`

warning: 7 warnings emitted

ソースコード

diff #

#![allow(non_snake_case, unused_imports, unused_must_use)]
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>()
        };
        ($T: ty, $N: expr) => {
            (0..$N).map(|_| scan.token::<$T>()).collect::<Vec<_>>()
        };
    }

    let C = input!(usize);
    let mut Y = input!(usize);

    if 100 * C > Y {
        writeln!(out, "can't exchange");
        return;
    }

    // 持っている通貨を特定する
    let mut c10000 = Y / 10000;
    Y -= 10000 * c10000;
    let mut c5000 = Y / 5000;
    Y -= 5000 * c5000;
    let mut c2000 = Y / 2000;
    Y -= 2000 * c2000;
    let mut c1000 = Y / 1000;
    Y -= 1000 * c1000;
    let mut c500 = Y / 500;
    Y -= 500 * c500;
    let mut c100 = Y / 100;
    Y -= 100 * c100;

    if c100 >= C {
        writeln!(out, "no exchange");
        return;
    }

    let d = C - c100;
    let a = ((d + 4) / 5) * 5 + c100;
    writeln!(out, "{}", a);
}

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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