結果
| 問題 |
No.2354 Poor Sight in Winter
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2023-06-16 22:29:49 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
AC
|
| 実行時間 | 50 ms / 2,000 ms |
| コード長 | 3,018 bytes |
| コンパイル時間 | 13,756 ms |
| コンパイル使用メモリ | 391,252 KB |
| 実行使用メモリ | 6,944 KB |
| 最終ジャッジ日時 | 2024-06-24 15:05:58 |
| 合計ジャッジ時間 | 13,862 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 26 |
ソースコード
pub mod binary_search {
type T = usize;
pub fn binary_search(mut ok: T, mut ng: T, f: impl Fn(T) -> bool) -> T {
let cont = |ok: T, ng: T| {
let l = ok.min(ng);
let r = ok.max(ng);
l + 1 < r
};
while cont(ok, ng) {
let x = (ok + ng) / 2;
if f(x) {
ok = x;
} else {
ng = x;
}
}
ok
}
}
pub mod scanner {
pub struct Scanner {
buf: Vec<String>,
}
impl Scanner {
pub fn new() -> Self {
Self { buf: vec![] }
}
pub fn new_from(source: &str) -> Self {
let source = String::from(source);
let buf = Self::split(source);
Self { buf }
}
pub fn next<T: std::str::FromStr>(&mut self) -> T {
loop {
if let Some(x) = self.buf.pop() {
return x.parse().ok().expect("");
}
let mut source = String::new();
std::io::stdin().read_line(&mut source).expect("");
self.buf = Self::split(source);
}
}
fn split(source: String) -> Vec<String> {
source
.split_whitespace()
.rev()
.map(String::from)
.collect::<Vec<_>>()
}
}
}
use crate::{binary_search::binary_search, scanner::Scanner};
fn main() {
let mut scanner = Scanner::new();
let t: usize = 1;
for _ in 0..t {
solve(&mut scanner);
}
}
fn shortest_path(n: usize, p: usize, xy: &Vec<(usize, usize)>) -> usize {
use std::cmp::Reverse;
let mut que = std::collections::BinaryHeap::<Reverse<(usize, usize)>>::new();
let mut dist = vec![None; n];
let from = 0;
que.push(Reverse((0, from)));
dist[from] = Some(0);
while let Some(Reverse((d, u))) = que.pop() {
if let Some(now_d) = dist[u] {
if now_d < d {
continue;
}
}
for v in 0..n {
if u == v {
continue;
}
let (ux, uy) = xy[u];
let (vx, vy) = xy[v];
let dx = ux.max(vx) - ux.min(vx);
let dy = uy.max(vy) - uy.min(vy);
let next_d = d + (dx + dy + p - 1) / p - 1;
if let Some(now_d) = dist[v] {
if now_d <= next_d {
continue;
}
}
que.push(Reverse((next_d, v)));
dist[v] = Some(next_d);
}
}
dist[1].unwrap()
}
fn solve(scanner: &mut Scanner) {
let n: usize = scanner.next();
let k: usize = scanner.next();
let n = n + 2;
let mut xy = vec![(0, 0); n];
for i in 0..n {
let x = scanner.next::<usize>();
let y = scanner.next::<usize>();
xy[i] = (x, y);
}
let ans = binary_search(200000, 0, |p| shortest_path(n, p, &xy) <= k);
println!("{}", ans);
}