結果
| 問題 | No.83 最大マッチング |
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2019-05-02 16:08:59 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
AC
|
| 実行時間 | 1 ms / 5,000 ms |
| コード長 | 2,463 bytes |
| コンパイル時間 | 13,421 ms |
| コンパイル使用メモリ | 405,424 KB |
| 実行使用メモリ | 6,820 KB |
| 最終ジャッジ日時 | 2024-12-31 13:31:12 |
| 合計ジャッジ時間 | 14,683 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 10 |
コンパイルメッセージ
warning: unused `Result` that must be used
--> src/main.rs:104:9
|
104 | write!(writer, "7{}", "1".repeat((n_digits_by_1 - 1) as usize));
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= 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 `write` (in Nightly builds, run with -Z macro-backtrace for more info)
warning: unused `Result` that must be used
--> src/main.rs:106:9
|
106 | write!(writer, "{}", "1".repeat(n_digits_by_1 as usize));
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: this `Result` may be an `Err` variant, which should be handled
= note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
ソースコード
use std::io;
use std::io::{BufRead, Write};
macro_rules! input {
(stdin = $stdin:expr, $($r:tt)*) => {
let s = {
let mut s = String::new();
$stdin.read_to_string(&mut s).unwrap();
s
};
let mut iter = s.split_whitespace();
input_inner!{iter, $($r)*}
};
}
macro_rules! input_inner {
($iter:expr) => {};
($iter:expr, ) => {};
($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
let $var = read_value!($iter, $t);
input_inner!{$iter $($r)*}
};
}
macro_rules! read_value {
($iter:expr, ( $($t:tt),* )) => {
( $(read_value!($iter, $t)),* )
};
($iter:expr, [ $t:tt ; $len:expr ]) => {
(0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
};
($iter:expr, chars) => {
read_value!($iter, String).chars().collect::<Vec<char>>()
};
($iter:expr, usize1) => {
read_value!($iter, usize) - 1
};
($iter:expr, $t:ty) => {
$iter.next().unwrap().parse::<$t>().expect("Parse error")
};
}
#[allow(unused_macros)]
macro_rules! assert_judge {
($method:ident, $input:expr, $expected:expr) => {
{
let input = $input.as_bytes();
let mut output = Vec::new();
$method(&input[..], &mut output);
let output = String::from_utf8(output).expect("Not UTF-8");
assert_eq!($expected, output);
}
};
}
fn main() {
let stdio = io::stdin();
let input = stdio.lock();
let output = io::stdout();
process(input, output)
}
// 0 -> 6
// 1 -> 2
// 2 -> 5
// 3 -> 5
// 4 -> 4
// 5 -> 5
// 6 -> 6
// 7 -> 3
// 8 -> 7
// 9 -> 6
// 2 -> 1
// 3 -> 7
// 4 -> 11
// 5 -> 71
// 6 -> 111
// 7 -> 711
// odd -> 7111...
// even -> 1111...
fn process<R, W>(mut reader: R, mut writer: W) where
R: BufRead,
W: Write {
input! {
stdin = reader,
n: i32
}
let n_digits_by_1 = n / 2;
if n % 2 == 1 {
write!(writer, "7{}", "1".repeat((n_digits_by_1 - 1) as usize));
} else {
write!(writer, "{}", "1".repeat(n_digits_by_1 as usize));
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn sample1() {
assert_judge!(process, "2", "1\
");
}
#[test]
fn sample2() {
assert_judge!(process, "3", "7\
");
}
#[test]
fn sample3() {
assert_judge!(process, "4", "11\
");
}
}