結果

問題 No.1473 おでぶなおばけさん
ユーザー uw_yu1rabbit
提出日時 2021-04-09 22:53:59
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 526 ms / 2,000 ms
コード長 3,516 bytes
コンパイル時間 12,834 ms
コンパイル使用メモリ 376,832 KB
実行使用メモリ 14,464 KB
最終ジャッジ日時 2024-06-25 06:37:38
合計ジャッジ時間 20,520 ms
ジャッジサーバーID
(参考情報)
judge4 / judge2
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 * 47
権限があれば一括ダウンロードができます
コンパイルメッセージ
warning: variable does not need to be mutable
 --> src/main.rs:9:9
  |
9 |     let mut debu:Vec<usize> = vec![0;n];
  |         ----^^^^
  |         |
  |         help: remove this `mut`
  |
  = note: `#[warn(unused_mut)]` on by default

warning: unused variable: `debu`
  --> src/main.rs:19:45
   |
19 | fn binary_search(g:&Vec<Vec<(usize,usize)>>,debu:&Vec<usize>) -> usize {
   |                                             ^^^^ help: if this is intentional, prefix it with an underscore: `_debu`
   |
   = note: `#[warn(unused_variables)]` on by default

ソースコード

diff #

//use proconio::input;
fn main() {
    let t = std::io::stdin();
    let mut read = snio::Reader::new(t.lock());
    let n = read.usize();
    let m = read.usize();
    let road_and_dist:Vec<(usize,usize,usize)> = (0..m).map(|_| (read.usize(),read.usize(), read.usize())).collect();
    let mut g = vec![Vec::new();n];
    let mut debu:Vec<usize> = vec![0;n];

    for (s,t,u) in road_and_dist {
        g[s - 1].push((t - 1,u));
        g[t - 1].push((s - 1,u));

    }
    let t = binary_search(&g,&debu);
    println!("{} {}",t,dijkstra(&g,t,0));
}
fn binary_search(g:&Vec<Vec<(usize,usize)>>,debu:&Vec<usize>) -> usize {
    let (mut lb , mut ub) = (0,1e9 as usize + 1);
    while ub - lb > 1 {
        let mid = (ub + lb) / 2;
        if dijkstra(g,mid,0) != 1e18 as usize{
            lb = mid;
        } else {
            ub = mid;
        }
    }
    lb
}

use std::collections::BinaryHeap;
use std::cmp::Reverse;
fn dijkstra(g:& Vec<Vec<(usize,usize)>>,debu:usize,start:usize) -> usize{
    let mut pq = BinaryHeap::new();
    let mut dist = vec![1e18 as usize;g.len()];
    pq.push(Reverse((0,start)));
    dist[start] = 0;
    while let Some(v) = pq.pop() {
        let (cost,now) = v.0;
        for (to,c) in &g[now] {
            if dist[now] < cost || *c < debu{
                continue;
            }
            if dist[*to] > 1 + dist[now] {
                dist[*to] = dist[now] + 1;
                pq.push(Reverse((dist[*to],*to)));
            }
        }
    }
    //println!("{}",dist[g.len() - 1]);
    dist[g.len() - 1]
}

#[allow(dead_code)]
pub mod snio {
    pub struct Reader<R: std::io::BufRead> {
        reader: R,
        buf: std::collections::VecDeque<String>,
    }

    impl<R: std::io::BufRead> Reader<R> {
        pub fn new(reader: R) -> Self {
            Self {
                reader,
                buf: std::collections::VecDeque::new(),
            }
        }
        fn load(&mut self) {
            while self.buf.is_empty() {
                let mut s = String::new();
                let length = self.reader.read_line(&mut s).unwrap();
                if length == 0 {
                    break;
                }
                self.buf.extend(s.split_whitespace().map(|s| s.to_owned()));
            }
        }
        pub fn string(&mut self) -> String {
            self.load();
            self.buf.pop_front().unwrap_or_else(|| panic!("input ended"))
        }
        pub fn char(&mut self) -> char {
            let string = self.string();
            let mut chars = string.chars();
            let res = chars.next().unwrap();
            assert!(chars.next().is_none(), "invalid input!");
            res
        }
        pub fn chars(&mut self) -> Vec<char> {
            self.read::<String>().chars().collect()
        }
        pub fn read<T: std::str::FromStr>(&mut self) -> T
            where
                <T as ::std::str::FromStr>::Err: ::std::fmt::Debug,
        {
            self.string().parse::<T>().expect("Failed to parse the input.")
        }
    }
    macro_rules! definition_of_reader_of_numbers {
            ($($ty:tt,)*) => {
                impl <R:std::io::BufRead> Reader<R> {
                    $(
                    #[inline]
                    pub fn $ty (&mut self) -> $ty {
                        self.read::<$ty>()
                    }
                    )*
                }
            }
        }
    definition_of_reader_of_numbers! {
        u8,u16,u32,u64,usize,
        i8,i16,i32,i64,isize,
    }
}
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