結果

問題 No.2567 A_1 > A_2 > ... > A_N
ユーザー ikdikd
提出日時 2023-12-02 16:46:51
言語 Rust
(1.83.0 + proconio)
結果
RE  
実行時間 -
コード長 4,188 bytes
コンパイル時間 14,974 ms
コンパイル使用メモリ 380,792 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-09-26 20:42:48
合計ジャッジ時間 14,591 ms
ジャッジサーバーID
(参考情報)
judge1 / judge5
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 * 11 RE * 5
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());
let t = scan!(usize, <~ scanner);
for _ in 0..t {
let (n, x) = scan!((usize, usize), <~ scanner);
if n * (n + 1) / 2 > x {
println!("-1");
continue;
}
let mut acc = 0;
let mut ans = Vec::new();
for i in 0..n {
assert!(x >= acc);
let mut y = (x - acc) - (n - i - 1) * (n - i) / 2; // ???
let mut ng = 0;
while y - ng > 1 {
let z = (y + ng) / 2;
if z > n - i - 1 {
// (z - 1) + (z - 2) + ... + (z - (n - i - 1))
let rest = ((z - 1) + (z - (n - i - 1))) * (n - i - 1) / 2;
if x.saturating_sub(acc + z) <= rest {
y = z;
} else {
ng = z;
}
} else {
ng = z;
}
}
ans.push(y);
acc += y;
}
for i in 1..n {
assert!(ans[i - 1] > ans[i]);
}
for i in 0..n {
print!("{}", ans[i]);
if i + 1 < n {
print!(" ");
} else {
print!("\n");
}
}
}
}
// ✂ --- 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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