結果

問題 No.2357 Guess the Function
ユーザー ikdikd
提出日時 2024-01-24 19:15:30
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 20 ms / 1,000 ms
コード長 3,424 bytes
コンパイル時間 12,073 ms
コンパイル使用メモリ 388,116 KB
実行使用メモリ 25,220 KB
平均クエリ数 2.91
最終ジャッジ日時 2024-09-28 07:07:56
合計ジャッジ時間 12,796 ms
ジャッジサーバーID
(参考情報)
judge5 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 1
other AC * 10
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

use scanner::Scanner;
use std::io;
fn main() {
let mut scanner = Scanner::from(io::stdin().lock());
println!("? 100");
let y = scan!(u32, <~ scanner);
if y == 99 {
println!("! 99 100");
return;
}
// (100 + A) % B = y,
// ((100 - y) + A) % B = 0,
// ((100 - y - 1) + A) % B = B - 1
let x = 100 - y - 1; // >= 1
println!("? {}", x);
let z = scan!(u32, <~ scanner);
let b = z + 1;
assert!(y < b);
let a = (0..b).filter(|a| (100 + a) % b == y).collect::<Vec<_>>();
assert_eq!(a.len(), 1);
println!("! {} {}", a[0], b);
}
// ✂ --- scanner --- ✂
#[allow(unused)]
mod scanner {
use std::fmt;
use std::io;
use std::str;
pub struct Scanner<R> {
r: R,
l: String,
i: usize,
}
impl<R> Scanner<R>
where
R: io::BufRead,
{
pub fn new(reader: R) -> Self {
Self {
r: reader,
l: String::new(),
i: 0,
}
}
pub fn scan<T>(&mut self) -> T
where
T: str::FromStr,
T::Err: fmt::Debug,
{
self.skip_blanks();
assert!(self.i < self.l.len()); // remain some character
assert_ne!(&self.l[self.i..=self.i], " ");
let rest = &self.l[self.i..];
let len = rest
.find(|ch| char::is_ascii_whitespace(&ch))
.unwrap_or_else(|| rest.len());
// parse self.l[self.i..(self.i + len)]
let val = rest[..len]
.parse()
.unwrap_or_else(|e| panic!("{:?}, attempt to read `{}`", e, rest));
self.i += len;
val
}
pub fn scan_vec<T>(&mut self, n: usize) -> Vec<T>
where
T: str::FromStr,
T::Err: fmt::Debug,
{
(0..n).map(|_| self.scan()).collect::<Vec<_>>()
}
fn skip_blanks(&mut self) {
loop {
match self.l[self.i..].find(|ch| !char::is_ascii_whitespace(&ch)) {
Some(j) => {
self.i += j;
break;
}
None => {
self.l.clear(); // clear buffer
let num_bytes = self
.r
.read_line(&mut self.l)
.unwrap_or_else(|_| panic!("invalid UTF-8"));
assert!(num_bytes > 0, "reached EOF :(");
self.i = 0;
}
}
}
}
}
impl<'a> From<&'a str> for Scanner<&'a [u8]> {
fn from(s: &'a str) -> Self {
Self::new(s.as_bytes())
}
}
impl<'a> From<io::StdinLock<'a>> for Scanner<io::BufReader<io::StdinLock<'a>>> {
fn from(stdin: io::StdinLock<'a>) -> Self {
Self::new(io::BufReader::new(stdin))
}
}
#[macro_export]
macro_rules! scan {
(( $($t: ty),+ ), <~ $scanner: expr) => {
( $(scan!($t, <~ $scanner)),+ )
};
([ $t: tt; $n: expr ], <~ $scanner: expr) => {
(0..$n).map(|_| scan!($t, <~ $scanner)).collect::<Vec<_>>()
};
($t: ty, <~ $scanner: expr) => {
$scanner.scan::<$t>()
};
}
}
// ✂ --- scanner --- ✂
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