結果

問題 No.2426 Select Plus or Minus
ユーザー naut3
提出日時 2023-08-19 20:33:30
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 1 ms / 2,000 ms
コード長 2,392 bytes
コンパイル時間 13,399 ms
コンパイル使用メモリ 379,096 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-11-29 16:06:43
合計ジャッジ時間 13,999 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
sample AC * 3
other AC * 41
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 macro definition: `input_line`
  --> src/main.rs:16:18
   |
16 |     macro_rules! input_line {
   |                  ^^^^^^^^^^
   |
   = note: `#[warn(unused_macros)]` on by default

warning: unused `Result` that must be used
  --> src/main.rs:38:17
   |
38 |                 writeln!(out, "{}\n{}", ops.len(), ops.iter().collect::<String>());
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = 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)

ソースコード

diff #
プレゼンテーションモードにする

#![allow(non_snake_case, unused_imports)]
use std::io::{self, prelude::*};
use std::str;
use std::time::Instant;
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>()
};
}
macro_rules! input_line {
($T: ty, $N: expr) => {
(0..$N).map(|_| scan.token::<$T>()).collect::<Vec<_>>()
};
}
let time = Instant::now();
macro_rules! rnd_bool {
() => {
time.elapsed().as_micros() % 2 == 1
};
}
let N = input!(usize);
loop {
let mut m = N;
let mut ops = vec![];
for _ in 0..10000 {
if m == 1 {
writeln!(out, "{}\n{}", ops.len(), ops.iter().collect::<String>());
return;
}
if m % 2 == 0 {
m /= 2;
ops.push('/');
} else {
let b = rnd_bool!();
if b {
if 3 * m + 1 > 1_000_000_000_000_000_000 {
break;
}
m = 3 * m + 1;
ops.push('+');
} else {
if 3 * m - 1 > 1_000_000_000_000_000_000 {
break;
}
m = 3 * m - 1;
ops.push('-');
}
}
}
}
}
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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