結果
問題 | No.1265 Balloon Survival |
ユーザー |
![]() |
提出日時 | 2020-10-24 00:25:38 |
言語 | Rust (1.83.0 + proconio) |
結果 |
AC
|
実行時間 | 54 ms / 2,000 ms |
コード長 | 4,626 bytes |
コンパイル時間 | 13,383 ms |
コンパイル使用メモリ | 400,828 KB |
実行使用メモリ | 17,828 KB |
最終ジャッジ日時 | 2024-07-21 14:14:59 |
合計ジャッジ時間 | 15,312 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 * 4 |
other | AC * 32 |
ソースコード
#![allow(unused_imports, unused_macros)]use kyoproio::*;use std::{collections::*,io::{self, prelude::*},iter,mem::{replace, swap},};fn main() -> io::Result<()> {std::thread::Builder::new().stack_size(64 * 1024 * 1024).spawn(|| {run(KInput::new(io::stdin().lock()),io::BufWriter::new(io::stdout().lock()),)})?.join().unwrap();Ok(())}fn run<I: Input, O: Write>(mut kin: I, mut out: O) {macro_rules! output { ($($args:expr),+) => { write!(&mut out, $($args),+).unwrap(); }; }macro_rules! outputln {($($args:expr),+) => { output!($($args),+); outputln!(); };() => { output!("\n"); if cfg!(debug_assertions) { out.flush().unwrap(); } }}let n: usize = kin.input();let p: Vec<(i64, i64)> = kin.seq(n);let mut pairs: Vec<_> = (0..n).flat_map(|i| (i + 1..n).map(move |j| (i, j))).collect();pairs.sort_by_cached_key(|&(i, j)| dist(p[i], p[j]));let mut removed = vec![false; n];let mut ans = 0;for (i, j) in pairs {if i == 0 && !removed[j] {removed[j] = true;ans += 1;} else if !removed[i] && !removed[j] {removed[i] = true;removed[j] = true;}}outputln!("{}", ans);}fn dist((x1, y1): (i64, i64), (x2, y2): (i64, i64)) -> i64 {(x1 - x2).pow(2) + (y1 - y2).pow(2)}// -----------------------------------------------------------------------------pub mod kyoproio {use std::io::prelude::*;pub trait Input {fn str(&mut self) -> &str;fn input<T: InputParse>(&mut self) -> T {T::input(self)}fn iter<T: InputParse>(&mut self) -> Iter<T, Self> {Iter(self, std::marker::PhantomData)}fn seq<T: InputParse, B: std::iter::FromIterator<T>>(&mut self, n: usize) -> B {self.iter().take(n).collect()}}pub struct KInput<R> {src: R,buf: String,pos: usize,}impl<R: BufRead> KInput<R> {pub fn new(src: R) -> Self {Self {src,buf: String::with_capacity(1 << 12),pos: 0,}}}impl<R: BufRead> Input for KInput<R> {fn str(&mut self) -> &str {loop {if self.pos >= self.buf.len() {self.pos = 0;self.buf.clear();if self.src.read_line(&mut self.buf).expect("io error") == 0 {return &self.buf;}}let range = self.pos..self.buf[self.pos..].find(|c: char| c.is_ascii_whitespace()).map(|i| i + self.pos).unwrap_or_else(|| self.buf.len());self.pos = range.end + 1;if range.end > range.start {return &self.buf[range];}}}}pub struct Iter<'a, T, I: ?Sized>(&'a mut I, std::marker::PhantomData<*const T>);impl<'a, T: InputParse, I: Input + ?Sized> Iterator for Iter<'a, T, I> {type Item = T;fn next(&mut self) -> Option<T> {Some(self.0.input())}}pub trait InputParse: Sized {fn input<I: Input + ?Sized>(src: &mut I) -> Self;}impl InputParse for Vec<u8> {fn input<I: Input + ?Sized>(src: &mut I) -> Self {src.str().as_bytes().to_owned()}}macro_rules! from_str_impl {{ $($T:ty)* } => {$(impl InputParse for $T {fn input<I: Input + ?Sized>(src: &mut I) -> Self {src.str().parse::<$T>().expect("parse error")}})*}}from_str_impl! {String char bool f32 f64 isize i8 i16 i32 i64 i128 usize u8 u16 u32 u64 u128}macro_rules! tuple_impl {($H:ident $($T:ident)*) => {impl<$H: InputParse, $($T: InputParse),*> InputParse for ($H, $($T),*) {fn input<I: Input + ?Sized>(src: &mut I) -> Self {($H::input(src), $($T::input(src)),*)}}tuple_impl!($($T)*);};() => {}}tuple_impl!(A B C D E F G);#[macro_export]macro_rules! kdbg {($($v:expr),*) => {if cfg!(debug_assertions) { dbg!($($v),*) } else { ($($v),*) }}}}