結果

問題 No.2354 Poor Sight in Winter
ユーザー nautnaut
提出日時 2023-06-18 11:55:34
言語 Rust
(1.77.0)
結果
AC  
実行時間 61 ms / 2,000 ms
コード長 3,087 bytes
コンパイル時間 4,540 ms
コンパイル使用メモリ 161,804 KB
実行使用メモリ 6,184 KB
最終ジャッジ日時 2023-09-08 07:34:27
合計ジャッジ時間 6,946 ms
ジャッジサーバーID
（参考情報） 		judge14 / judge13
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 1 ms
4,380 KB
testcase_01 AC 1 ms
4,376 KB
testcase_02 AC 1 ms
4,380 KB
testcase_03 AC 1 ms
4,380 KB
testcase_04 AC 1 ms
4,380 KB
testcase_05 AC 1 ms
4,380 KB
testcase_06 AC 1 ms
4,380 KB
testcase_07 AC 1 ms
4,376 KB
testcase_08 AC 1 ms
4,380 KB
testcase_09 AC 1 ms
4,380 KB
testcase_10 AC 1 ms
4,380 KB
testcase_11 AC 48 ms
6,088 KB
testcase_12 AC 51 ms
6,092 KB
testcase_13 AC 61 ms
6,172 KB
testcase_14 AC 59 ms
6,140 KB
testcase_15 AC 53 ms
6,184 KB
testcase_16 AC 54 ms
6,084 KB
testcase_17 AC 58 ms
6,060 KB
testcase_18 AC 21 ms
4,376 KB
testcase_19 AC 40 ms
5,344 KB
testcase_20 AC 24 ms
4,568 KB
testcase_21 AC 3 ms
4,380 KB
testcase_22 AC 11 ms
4,384 KB
testcase_23 AC 12 ms
4,380 KB
testcase_24 AC 33 ms
5,136 KB
testcase_25 AC 9 ms
4,376 KB
testcase_26 AC 7 ms
4,380 KB
testcase_27 AC 1 ms
4,376 KB
testcase_28 AC 2 ms
4,380 KB
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コンパイルメッセージ
warning: unused `Result` that must be used
   --> Main.rs:106:5
    |
106 |     writeln!(out, "{}", ok);
    |     ^^^^^^^^^^^^^^^^^^^^^^^
    |
    = 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)

warning: 1 warning emitted

ソースコード

diff # 

#![allow(non_snake_case, unused_imports)]
use std::io::{self, prelude::*};
use std::str;

fn dist(x1: usize, y1: usize, x2: usize, y2: usize) -> usize {
    let mut ret = 0;
    if x1 < x2 {
        ret += x2 - x1;
    } else {
        ret += x1 - x2;
    }

    if y1 < y2 {
        ret += y2 - y1;
    } else {
        ret += y1 - y2;
    }

    ret
}

fn dijkstra(graph: &Vec<Vec<(usize, isize)>>, start: usize) -> Vec<isize> {
    let n = graph.len();
    const INF: isize = 1 << 60;

    let mut dist = vec![INF; n];
    let mut seen = vec![false; n];

    dist[start] = 0;

    let mut hq = std::collections::BinaryHeap::new();
    hq.push((-0, start));

    while let Some((_, now)) = hq.pop() {
        if seen[now] {
            continue;
        }

        for &(nxt, d) in graph[now].iter() {
            if dist[nxt] > dist[now] + d {
                dist[nxt] = dist[now] + d;
                hq.push((-dist[nxt], nxt));
            }
        }

        seen[now] = true;
    }

    return dist;
}

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>()
        };
    }

    let N = input!(usize);
    let K = input!(isize);
    let (sx, sy) = (input!(usize), input!(usize));
    let (gx, gy) = (input!(usize), input!(usize));

    let mut XY = vec![(sx, sy), (gx, gy)];

    for _ in 0..N {
        let (x, y) = (input!(usize), input!(usize));
        XY.push((x, y));
    }

    let mut ng = 0;
    let mut ok = 200_010;

    while ok - ng > 1 {
        let p = (ok + ng) / 2;

        let mut graph = vec![vec![]; N + 2];

        for i in 0..N + 2 {
            let (x1, y1) = XY[i];

            for j in 0..N + 2 {
                if i == j {
                    continue;
                }
                let (x2, y2) = XY[j];
                let d = dist(x1, y1, x2, y2);

                graph[i].push((j, ((d - 1) / p) as isize));
            }
        }

        let dist = dijkstra(&graph, 0)[1];

        if dist <= K {
            ok = p;
        } else {
            ng = p;
        }
    }

    writeln!(out, "{}", ok);
}

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())
            }
        }
    }
}
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