#964253 (Rust) No.2696 Sign Creation

• 問題: No.2696 Sign Creation
• ユーザー: naut3
• 提出日時: 2024-03-22 22:50:50
• 言語: Rust (1.83.0 + proconio)
• 結果: TLE
• 実行時間: -
• コード長: 5,678 bytes
• コンパイル時間: 14,198 ms
• コンパイル使用メモリ: 388,692 KB
• 実行使用メモリ: 13,636 KB
• 最終ジャッジ日時: 2024-12-20 12:18:50
• 合計ジャッジ時間: 27,456 ms
• ジャッジサーバーID （参考情報）: judge4 / judge5

ファイルパターン	結果
sample	AC * 3
other	AC * 29 WA * 6 TLE * 3

コンパイルメッセージ

warning: value assigned to `ans_now` is never read
   --> src/main.rs:126:29
    |
126 |                     let mut ans_now = original_ans;
    |                             ^^^^^^^
    |
    = help: maybe it is overwritten before being read?
    = note: `#[warn(unused_assignments)]` on by default

ソースコード

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

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>()
        };
        ($T: ty, $N: expr) => {
            (0..$N).map(|_| scan.token::<$T>()).collect::<Vec<_>>()
        };
    }

    let H = input!(isize);
    let W = input!(isize);
    let N = input!(usize);
    let D = input!(isize);

    let dist = |y1: isize, x1: isize, y2: isize, x2: isize| (y1 - y2).abs() + (x1 - x2).abs();

    let mut points = vec![];
    let mut has_star = vec![vec![usize::MAX; W as usize + 1]; H as usize + 1];

    for i in 0..N {
        let (y, x) = (input!(isize), input!(isize));
        points.push((y, x));
        has_star[y as usize][x as usize] = i;
    }

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

    for i in 0..N {
        let (y, x) = points[i];

        for dy in -D..=D {
            for dx in -D..=D {
                if dist(dy, dx, 0, 0) <= D {
                    if y + dy >= 1 && y + dy <= H && x + dx >= 1 && x + dx <= W {
                        if has_star[(y + dy) as usize][(x + dx) as usize] != usize::MAX {
                            graph[i].push(has_star[(y + dy) as usize][(x + dx) as usize]);
                        }
                    }
                }
            }
        }
    }

    let mut root = (0..N).collect::<Vec<_>>();
    let mut seen = vec![false; N];
    let mut q = std::collections::VecDeque::default();

    for i in 0..N {
        if seen[i] {
            continue;
        }

        q.push_front(i);
        seen[i] = true;

        while let Some(now) = q.pop_front() {
            for &nxt in graph[now].iter() {
                if seen[nxt] {
                    continue;
                }

                seen[nxt] = true;
                root[nxt] = i;
                q.push_back(nxt);
            }
        }
    }

    let mut original_ans = 0;

    let mut cnt = vec![0; N];

    for &r in root.iter() {
        cnt[r] += 1;
    }

    for i in 0..N {
        if cnt[i] >= 2 {
            original_ans += 1;
        }
    }

    let mut ans_max = usize::MIN;
    let mut ans_min = usize::MAX;

    for i in 0..N {
        let (y, x) = points[i];

        for dy in -D..=D {
            for dx in -D..=D {
                if y + dy >= 1 && y + dy <= H && x + dx >= 1 && x + dx <= W {
                    // put star (y + dy, x + dx)

                    let mut roots = std::collections::BTreeSet::new();

                    for dy2 in -D..=D {
                        for dx2 in -D..=D {
                            if dist(dy2, dx2, 0, 0) <= D {
                                if y + dy + dy2 >= 1
                                    && y + dy + dy2 <= H
                                    && x + dx + dx2 >= 1
                                    && x + dx + dx2 <= W
                                {
                                    if has_star[(y + dy + dy2) as usize][(x + dx + dx2) as usize]
                                        != usize::MAX
                                    {
                                        roots.insert(
                                            root[has_star[(y + dy + dy2) as usize]
                                                [(x + dx + dx2) as usize]],
                                        );
                                    }
                                }
                            }
                        }
                    }

                    let mut ans_now = original_ans;
                    let mut root_cnt = 0;
                    let mut alone_cnt = 0;

                    for &r in roots.iter() {
                        if cnt[r] >= 2 {
                            root_cnt += 1;
                        } else if cnt[r] == 1 {
                            alone_cnt += 1;
                        }
                    }

                    if alone_cnt >= 1 && roots.len() == alone_cnt {
                        // 孤立した星とだけ接続した場合
                        ans_now = original_ans + 1;
                    } else if root_cnt == 0 && alone_cnt == 0 {
                        // 何も接続しない場合
                        ans_now = original_ans;
                    } else {
                        // すでに星座をなす星と接続した場合
                        ans_now = original_ans + 1 - root_cnt;
                    }

                    ans_max = std::cmp::max(ans_max, ans_now);
                    ans_min = std::cmp::min(ans_min, ans_now);
                }
            }
        }
    }

    writeln!(out, "{} {}", ans_min, ans_max);
}

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())
            }
        }
    }
}