結果
| 問題 | No.468 役に立つ競技プログラミング実践編 |
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2017-10-20 17:48:10 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 3,178 bytes |
| 記録 | |
| コンパイル時間 | 13,560 ms |
| コンパイル使用メモリ | 400,312 KB |
| 実行使用メモリ | 34,104 KB |
| 最終ジャッジ日時 | 2024-11-21 10:48:28 |
| 合計ジャッジ時間 | 80,526 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | WA * 11 TLE * 20 |
| other | AC * 6 |
ソースコード
#[allow(unused_imports)]
use std::cmp::{max, min, Ordering};
#[allow(unused_imports)]
use std::collections::{HashMap, HashSet};
mod util {
use std::io::stdin;
use std::str::FromStr;
use std::fmt::Debug;
#[allow(dead_code)]
pub fn line() -> String {
let mut line: String = String::new();
stdin().read_line(&mut line).unwrap();
line.trim().to_string()
}
#[allow(dead_code)]
pub fn get<T: FromStr>() -> T
where
<T as FromStr>::Err: Debug,
{
let mut line: String = String::new();
stdin().read_line(&mut line).unwrap();
line.trim().parse().unwrap()
}
#[allow(dead_code)]
pub fn gets<T: FromStr>() -> Vec<T>
where
<T as FromStr>::Err: Debug,
{
let mut line: String = String::new();
stdin().read_line(&mut line).unwrap();
line.split_whitespace()
.map(|t| t.parse().unwrap())
.collect()
}
#[allow(dead_code)]
pub fn get2<T: FromStr, U: FromStr>() -> (T, U)
where
<T as FromStr>::Err: Debug,
<U as FromStr>::Err: Debug,
{
let mut line: String = String::new();
stdin().read_line(&mut line).unwrap();
let mut iter = line.split_whitespace();
(
iter.next().unwrap().parse().unwrap(),
iter.next().unwrap().parse().unwrap(),
)
}
#[allow(dead_code)]
pub fn get3<S: FromStr, T: FromStr, U: FromStr>() -> (S, T, U)
where
<S as FromStr>::Err: Debug,
<T as FromStr>::Err: Debug,
<U as FromStr>::Err: Debug,
{
let mut line: String = String::new();
stdin().read_line(&mut line).unwrap();
let mut iter = line.split_whitespace();
(
iter.next().unwrap().parse().unwrap(),
iter.next().unwrap().parse().unwrap(),
iter.next().unwrap().parse().unwrap(),
)
}
}
// std::cmp::Reverse doesn't have Clone.
#[derive(Eq, PartialEq, Clone)]
struct Rev<T>(pub T);
impl<T: PartialOrd> PartialOrd for Rev<T> {
fn partial_cmp(&self, other: &Rev<T>) -> Option<Ordering> {
other.0.partial_cmp(&self.0)
}
}
impl<T: Ord> Ord for Rev<T> {
fn cmp(&self, other: &Rev<T>) -> Ordering {
other.0.cmp(&self.0)
}
}
#[allow(unused_macros)]
macro_rules! debug {
($x: expr) => {
println!("{}: {:?}", stringify!($x), $x)
}
}
fn dfs(i: usize, edges_rev: &Vec<Vec<(usize, usize)>>, p: &mut HashSet<usize>) -> usize {
let l = edges_rev[i]
.iter()
.map(|&(a, c)| (dfs(a, edges_rev, p) + c, a))
.collect::<Vec<_>>();
let longest = l.iter().map(|t| t.0).max().unwrap_or(0);
for &(_, a) in l.iter().filter(|t| t.0 < longest) {
p.insert(a);
}
longest
}
fn main() {
let (n, m): (usize, usize) = util::get2();
let abc: Vec<(usize, usize, usize)> = (0..m).map(|_| util::get3()).collect();
let mut edges_rev = vec![Vec::new(); n];
let mut p = HashSet::new();
for &(a, b, c) in &abc {
edges_rev[b].push((a, c));
}
let t = dfs(n - 1, &edges_rev, &mut p);
println!("{} {}/{}", t, p.len(), n);
}