#876226 (Rust) No.2316 Freight Train

• 問題: No.2316 Freight Train
• ユーザー: tipstar0125
• 提出日時: 2023-05-31 12:11:44
• 言語: Rust (1.77.0 + proconio)
• 結果: AC
• 実行時間: 64 ms / 2,000 ms
• コード長: 6,355 bytes
• コンパイル時間: 14,936 ms
• コンパイル使用メモリ: 377,552 KB
• 実行使用メモリ: 8,320 KB
• 最終ジャッジ日時: 2024-06-08 20:59:43
• 合計ジャッジ時間: 16,824 ms
• ジャッジサーバーID （参考情報）: judge1 / judge5

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	1 ms; 5,248 KB
testcase_01	AC	1 ms; 5,248 KB
testcase_02	AC	1 ms; 5,376 KB
testcase_03	AC	64 ms; 8,064 KB
testcase_04	AC	28 ms; 5,376 KB
testcase_05	AC	22 ms; 5,376 KB
testcase_06	AC	7 ms; 5,376 KB
testcase_07	AC	34 ms; 5,632 KB
testcase_08	AC	39 ms; 6,528 KB
testcase_09	AC	37 ms; 6,272 KB
testcase_10	AC	37 ms; 6,144 KB
testcase_11	AC	43 ms; 6,784 KB
testcase_12	AC	53 ms; 7,168 KB
testcase_13	AC	56 ms; 8,192 KB
testcase_14	AC	59 ms; 8,192 KB
testcase_15	AC	56 ms; 8,192 KB
testcase_16	AC	55 ms; 8,192 KB
testcase_17	AC	55 ms; 8,192 KB
testcase_18	AC	54 ms; 8,320 KB
testcase_19	AC	55 ms; 8,192 KB
testcase_20	AC	54 ms; 8,192 KB
testcase_21	AC	55 ms; 8,192 KB
testcase_22	AC	55 ms; 8,192 KB
testcase_23	AC	40 ms; 8,192 KB
testcase_24	AC	45 ms; 8,192 KB
testcase_25	AC	43 ms; 8,320 KB
testcase_26	AC	39 ms; 8,192 KB
testcase_27	AC	23 ms; 5,376 KB
testcase_28	AC	1 ms; 5,376 KB

ソースコード

#![allow(non_snake_case)]
#![allow(unused_imports)]
#![allow(unused_macros)]
#![allow(clippy::needless_range_loop)]
#![allow(clippy::comparison_chain)]
#![allow(clippy::nonminimal_bool)]
#![allow(clippy::neg_multiply)]
#![allow(dead_code)]
use std::cmp::Reverse;
use std::collections::{BTreeMap, BTreeSet, BinaryHeap, VecDeque};

#[derive(Default)]
struct Solver {}
impl Solver {
    fn solve(&mut self) {
        input! {
            N: usize,
            Q: usize,
            P: [isize; N],
            AB: [(usize1, usize1); Q]
        }

        let mut uf = UnionFind::new(N);
        for (i, &p) in P.iter().enumerate() {
            if p != -1 {
                uf.unite(i, p as usize - 1);
            }
        }

        for &(a, b) in &AB {
            if uf.is_same(a, b) {
                println!("Yes");
            } else {
                println!("No");
            }
        }
    }
}

fn join_to_string<T: std::string::ToString>(v: &[T], sep: &str) -> String {
    v.iter()
        .fold("".to_string(), |s, x| s + x.to_string().as_str() + sep)
}

#[derive(Debug, Clone)]
struct UnionFind {
    parent: Vec<isize>,
    size: usize,
}

impl UnionFind {
    fn new(n: usize) -> Self {
        UnionFind {
            parent: vec![-1; n],
            size: n,
        }
    }
    fn find(&mut self, x: usize) -> usize {
        if self.parent[x] < 0 {
            return x;
        }
        let root = self.find(self.parent[x] as usize);
        self.parent[x] = root as isize;
        root
    }
    fn unite(&mut self, x: usize, y: usize) -> Option<(usize, usize)> {
        let root_x = self.find(x);
        let root_y = self.find(y);
        if root_x == root_y {
            return None;
        }
        let size_x = -self.parent[root_x];
        let size_y = -self.parent[root_y];
        self.size -= 1;
        if size_x >= size_y {
            self.parent[root_x] -= size_y;
            self.parent[root_y] = root_x as isize;
            Some((root_x, root_y))
        } else {
            self.parent[root_y] -= size_x;
            self.parent[root_x] = root_y as isize;
            Some((root_y, root_x))
        }
    }
    fn is_same(&mut self, x: usize, y: usize) -> bool {
        self.find(x) == self.find(y)
    }
    fn is_root(&mut self, x: usize) -> bool {
        self.find(x) == x
    }
    fn get_union_size(&mut self, x: usize) -> usize {
        let root = self.find(x);
        -self.parent[root] as usize
    }
    fn get_size(&self) -> usize {
        self.size
    }
    fn roots(&self) -> Vec<usize> {
        (0..self.parent.len())
            .filter(|i| self.parent[*i] < 0)
            .collect::<Vec<usize>>()
    }
    fn members(&mut self, x: usize) -> Vec<usize> {
        let root = self.find(x);
        (0..self.parent.len())
            .filter(|i| self.find(*i) == root)
            .collect::<Vec<usize>>()
    }
    fn all_group_members(&mut self) -> BTreeMap<usize, Vec<usize>> {
        let mut groups_map: BTreeMap<usize, Vec<usize>> = BTreeMap::new();
        for x in 0..self.parent.len() {
            let r = self.find(x);
            groups_map.entry(r).or_default().push(x);
        }
        groups_map
    }
}

fn main() {
    std::thread::Builder::new()
        .stack_size(128 * 1024 * 1024)
        .spawn(|| Solver::default().solve())
        .unwrap()
        .join()
        .unwrap();
}

#[macro_export]
macro_rules! input {
    () => {};
    (mut $var:ident: $t:tt, $($rest:tt)*) => {
        let mut $var = __input_inner!($t);
        input!($($rest)*)
    };
    ($var:ident: $t:tt, $($rest:tt)*) => {
        let $var = __input_inner!($t);
        input!($($rest)*)
    };
    (mut $var:ident: $t:tt) => {
        let mut $var = __input_inner!($t);
    };
    ($var:ident: $t:tt) => {
        let $var = __input_inner!($t);
    };
}

#[macro_export]
macro_rules! __input_inner {
    (($($t:tt),*)) => {
        ($(__input_inner!($t)),*)
    };
    ([$t:tt; $n:expr]) => {
        (0..$n).map(|_| __input_inner!($t)).collect::<Vec<_>>()
    };
    ([$t:tt]) => {{
        let n = __input_inner!(usize);
        (0..n).map(|_| __input_inner!($t)).collect::<Vec<_>>()
    }};
    (chars) => {
        __input_inner!(String).chars().collect::<Vec<_>>()
    };
    (bytes) => {
        __input_inner!(String).into_bytes()
    };
    (usize1) => {
        __input_inner!(usize) - 1
    };
    ($t:ty) => {
        $crate::read::<$t>()
    };
}

#[macro_export]
macro_rules! println {
    () => {
        $crate::write(|w| {
            use std::io::Write;
            std::writeln!(w).unwrap()
        })
    };
    ($($arg:tt)*) => {
        $crate::write(|w| {
            use std::io::Write;
            std::writeln!(w, $($arg)*).unwrap()
        })
    };
}

#[macro_export]
macro_rules! print {
    ($($arg:tt)*) => {
        $crate::write(|w| {
            use std::io::Write;
            std::write!(w, $($arg)*).unwrap()
        })
    };
}

#[macro_export]
macro_rules! flush {
    () => {
        $crate::write(|w| {
            use std::io::Write;
            w.flush().unwrap()
        })
    };
}

pub fn read<T>() -> T
where
    T: std::str::FromStr,
    T::Err: std::fmt::Debug,
{
    use std::cell::RefCell;
    use std::io::*;

    thread_local! {
        pub static STDIN: RefCell<StdinLock<'static>> = RefCell::new(stdin().lock());
    }

    STDIN.with(|r| {
        let mut r = r.borrow_mut();
        let mut s = vec![];
        loop {
            let buf = r.fill_buf().unwrap();
            if buf.is_empty() {
                break;
            }
            if let Some(i) = buf.iter().position(u8::is_ascii_whitespace) {
                s.extend_from_slice(&buf[..i]);
                r.consume(i + 1);
                if !s.is_empty() {
                    break;
                }
            } else {
                s.extend_from_slice(buf);
                let n = buf.len();
                r.consume(n);
            }
        }
        std::str::from_utf8(&s).unwrap().parse().unwrap()
    })
}

pub fn write<F>(f: F)
where
    F: FnOnce(&mut std::io::BufWriter<std::io::StdoutLock>),
{
    use std::cell::RefCell;
    use std::io::*;

    thread_local! {
        pub static STDOUT: RefCell<BufWriter<StdoutLock<'static>>> =
            RefCell::new(BufWriter::new(stdout().lock()));
    }

    STDOUT.with(|w| f(&mut w.borrow_mut()))
}