結果

問題 No.312 置換処理
ユーザー MasuqaT
提出日時 2019-05-04 22:50:01
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 27 ms / 2,000 ms
コード長 3,706 bytes
コンパイル時間 15,393 ms
コンパイル使用メモリ 387,012 KB
実行使用メモリ 10,112 KB
最終ジャッジ日時 2024-11-15 12:27:33
合計ジャッジ時間 17,209 ms
ジャッジサーバーID
(参考情報)
judge4 / judge5
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
other AC * 45
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:124:17
    |
124 |                 write!(writer, "{}", i);
    |                 ^^^^^^^^^^^^^^^^^^^^^^^
    |
    = 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:138:5
    |
138 |     write!(writer, "{}", if n % 2 == 0 && n / 2 != 2 { n / 2 } else { n });
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = 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

diff #
プレゼンテーションモードにする

use std::io;
use std::io::{BufRead, Write};
macro_rules! input {
(source = $s:expr, $($r:tt)*) => {
let mut iter = $s.split_whitespace();
input_inner!{iter, $($r)*}
};
(stdin = $s:expr, $($r:tt)*) => {
let s = {
let mut s = String::new();
$s.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);
}
};
}
#[allow(unused_macros)]
macro_rules! assert_judge_with_output {
($method:ident, $input:expr) => {
{
let input = $input.as_bytes();
let mut output = Vec::new();
$method(&input[..], &mut output);
String::from_utf8(output).expect("Not UTF-8")
}
};
}
fn main() {
let stdio = io::stdin();
let input = stdio.lock();
let output = io::stdout();
process(input, output);
}
fn process<R, W>(mut reader: R, mut writer: W) -> () where
R: BufRead,
W: Write {
input! {
stdin = reader,
n: usize
}
let rt_n = (n as f64).sqrt();
let limit = rt_n.ceil() as usize;
// let mut vec: Vec<_> = (3..limit + 1).collect();
//
// for p in 3..limit + 1 {
// vec.retain(|&x| x <= p || x % p != 0);
// }
//
// for p in vec {
// if n % p == 0 {
// write!(writer, "{}", p);
// return;
// }
// }
//
// write!(writer, "{}", original_n);
let mut least_primes = vec![0; limit + 1];
least_primes[1] = 1;
least_primes[2] = 2;
for i in 3..limit + 1 {
if least_primes[i] == 0 {
if n % i == 0 {
write!(writer, "{}", i);
return;
}
least_primes[i] = i;
for j in (2 * i..limit + 1).step_by(i) {
if least_primes[j] == 0 {
least_primes[j] = i;
}
}
}
}
write!(writer, "{}", if n % 2 == 0 && n / 2 != 2 { n / 2 } else { n });
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn sample1() {
assert_judge!(process, "9", "3");
}
#[test]
fn sample2() {
assert_judge!(process, "30", "3");
}
#[test]
fn sample3() {
assert_judge!(process, "114514", "31");
}
#[test]
fn challenge02() {
assert_judge!(process, "999999999958", "499999999979");
}
#[test]
fn system_test9() {
assert_judge!(process, "842870279900", "4");
}
#[test]
fn t2() {
assert_judge!(process, "4", "4");
}
}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
0