結果
問題 | No.2426 Select Plus or Minus |
ユーザー |
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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 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 41 |
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
#![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())}}}}