結果

問題 No.2427 Tree Distance Two
ユーザー haihamabossuhaihamabossu
提出日時 2023-08-18 21:53:39
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 387 ms / 2,000 ms
コード長 5,251 bytes
コンパイル時間 12,262 ms
コンパイル使用メモリ 377,800 KB
実行使用メモリ 93,056 KB
最終ジャッジ日時 2024-11-28 06:45:31
合計ジャッジ時間 19,839 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge2
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ファイルパターン 結果
other AC * 35
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ソースコード

diff # 

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<_>>()
        }
    }
}

pub mod tree {

    #[derive(Clone)]
    pub struct Edge {
        pub to: usize,

        pub id: usize,

        pub rev: usize,

        pub cost: isize,
    }

    pub struct Tree {
        pub n: usize,

        root: usize,

        pub edges: Vec<Vec<Edge>>,

        pub parent: Vec<Option<usize>>,

        pub depth: Vec<usize>,

        pub subtree_size: Vec<usize>,

        pub pre_order: Vec<usize>,

        pub post_order: Vec<usize>,

        pub euler_tour: Vec<usize>,
    }

    impl Tree {
        pub fn new(n: usize) -> Tree {
            Tree {
                n,
                root: 0,
                edges: vec![vec![]; n],
                parent: vec![None; n],
                depth: vec![0; n],
                subtree_size: vec![0; n],
                pre_order: vec![],
                post_order: vec![],
                euler_tour: vec![],
            }
        }

        pub fn init(scanner: &mut crate::scanner::Scanner, indexed: usize, weighted: bool) -> Tree {
            let n: usize = scanner.next();
            let mut tree = Tree::new(n);
            for id in 0..n - 1 {
                let u: usize = scanner.next::<usize>() - indexed;
                let v: usize = scanner.next::<usize>() - indexed;
                let cost: isize;
                if weighted {
                    cost = scanner.next();
                } else {
                    cost = 1;
                }
                tree.add_edge(u, v, id, cost);
            }
            tree.set_root(0);
            tree
        }

        pub fn add_edge(&mut self, u: usize, v: usize, id: usize, cost: isize) {
            {
                let to = v;
                let rev = self.edges[v].len();
                self.edges[u].push(Edge { to, id, rev, cost });
            }
            {
                let to = u;
                let rev = self.edges[u].len() - 1;
                self.edges[v].push(Edge { to, id, rev, cost });
            }
        }

        pub fn degree(&self, u: usize) -> usize {
            self.edges[u].len()
        }

        pub fn set_root(&mut self, root: usize) {
            let n = self.n;
            self.root = root;
            self.parent = vec![None; n];
            self.depth = vec![0; n];
            self.subtree_size = vec![0; n];
            self.pre_order = vec![];
            self.post_order = vec![];
            self.euler_tour = vec![];
            let mut stack: Vec<(usize, usize, usize)> = vec![];
            stack.push((root, 0, 0));
            while let Some((u, i, d)) = stack.pop() {
                if i == 0 {
                    self.subtree_size[u] += 1;
                    self.pre_order.push(u);
                }
                if i == self.degree(u) {
                    if let Some(p) = self.parent[u] {
                        self.subtree_size[p] += self.subtree_size[u];
                    }
                    self.post_order.push(u);
                    self.euler_tour.push(u);
                    continue;
                }
                stack.push((u, i + 1, d));
                let edge = &self.edges[u][i];
                if Some(edge.to) == self.parent[u] {
                    continue;
                }
                self.parent[edge.to] = Some(u);
                self.depth[edge.to] = d + 1;
                self.euler_tour.push(u);
                stack.push((edge.to, 0, d + 1));
            }
        }
    }
}

use crate::{scanner::Scanner, tree::Tree};
use std::io::Write;
fn main() {
    let mut scanner = Scanner::new();
    let out = std::io::stdout();
    let mut out = std::io::BufWriter::new(out.lock());
    let t: usize = 1;
    for _ in 0..t {
        solve(&mut scanner, &mut out);
    }
}
fn solve(scanner: &mut Scanner, out: &mut std::io::BufWriter<std::io::StdoutLock>) {
    let n: usize = scanner.next();
    let mut tree = Tree::new(n);
    for id in 0..n - 1 {
        let u: usize = scanner.next::<usize>() - 1;
        let v: usize = scanner.next::<usize>() - 1;
        tree.add_edge(u, v, id, 1);
    }
    tree.set_root(0);
    for u in 0..n {
        let mut ans = 0;
        for edge in tree.edges[u].iter() {
            let v = edge.to;
            ans += tree.edges[v].len() - 1;
        }
        writeln!(out, "{}", ans).unwrap();
    }
}
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