結果

問題 No.2325 Skill Tree
ユーザー haihamabossuhaihamabossu
提出日時 2023-05-28 14:41:15
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 590 ms / 3,000 ms
コード長 3,617 bytes
コンパイル時間 17,278 ms
コンパイル使用メモリ 377,592 KB
実行使用メモリ 21,248 KB
最終ジャッジ日時 2024-12-27 02:30:27
合計ジャッジ時間 38,087 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 2
other AC * 36
権限があれば一括ダウンロードができます

ソースコード

diff # 

pub mod chminmax {
    pub fn chmin<T: Copy + Ord>(a: &mut T, b: &T) -> bool {
        if *a > *b {
            *a = *b;
            true
        } else {
            false
        }
    }

    pub fn chmax<T: Copy + Ord>(a: &mut T, b: &T) -> bool {
        if *a < *b {
            *a = *b;
            true
        } else {
            false
        }
    }
}

pub mod lower_bound {
    pub fn lower_bound<T: Ord>(list: &[T], val: &T) -> usize {
        let mut l = 0;
        let mut r = list.len();
        while l < r {
            let x = (l + r) / 2;
            match list[x].cmp(val) {
                std::cmp::Ordering::Less => {
                    l = x + 1;
                }
                std::cmp::Ordering::Equal | std::cmp::Ordering::Greater => {
                    r = x;
                }
            }
        }
        l
    }

    pub fn upper_bound<T: Ord>(list: &[T], val: &T) -> usize {
        let mut l = 0;
        let mut r = list.len();
        while l < r {
            let x = (l + r) / 2;
            match list[x].cmp(val) {
                std::cmp::Ordering::Less | std::cmp::Ordering::Equal => {
                    l = x + 1;
                }
                std::cmp::Ordering::Greater => {
                    r = x;
                }
            }
        }
        l
    }
}

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 std::collections::VecDeque;

use crate::{chminmax::chmax, lower_bound::upper_bound, scanner::Scanner};

fn main() {
    let mut scanner = Scanner::new();
    let t: usize = 1;
    for _ in 0..t {
        solve(&mut scanner);
    }
}

fn solve(scanner: &mut Scanner) {
    let n: usize = scanner.next();
    let mut g = vec![vec![]; n];
    for v in 2..=n {
        let l: usize = scanner.next();
        let u: usize = scanner.next();
        g[u - 1].push((v - 1, l));
    }
    let mut que = VecDeque::new();
    que.push_back(0);
    let mut res1: Vec<(usize, usize)> = vec![(1, 1)];
    let mut res2: Vec<isize> = vec![-1; n];
    res2[0] = 1;
    while let Some(u) = que.pop_front() {
        for &(v, l) in g[u].iter() {
            if res2[u] == -1 {
                continue;
            }
            let now = l.max(res2[u] as usize) as isize;
            chmax(&mut res2[v], &now);
            res1.push((res2[v] as usize, v));
            que.push_back(v);
        }
    }
    res1.sort();
    let q: usize = scanner.next();
    for _ in 0..q {
        let t: usize = scanner.next();
        if t == 1 {
            let x: usize = scanner.next();
            println!("{}", upper_bound(&res1, &(x, !0)));
        } else {
            let y: usize = scanner.next();
            println!("{}", res2[y - 1]);
        }
    }
}
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