結果
問題 | No.2325 Skill Tree |
ユーザー | zeronosu77108 |
提出日時 | 2023-05-28 14:28:09 |
言語 | Rust (1.83.0 + proconio) |
結果 |
AC
|
実行時間 | 458 ms / 3,000 ms |
コード長 | 3,891 bytes |
コンパイル時間 | 20,184 ms |
コンパイル使用メモリ | 405,816 KB |
実行使用メモリ | 54,380 KB |
最終ジャッジ日時 | 2024-12-27 01:28:47 |
合計ジャッジ時間 | 35,798 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 36 |
コンパイルメッセージ
warning: unused import: `std::cmp::Reverse` --> src/main.rs:1:5 | 1 | use std::cmp::Reverse; | ^^^^^^^^^^^^^^^^^ | = note: `#[warn(unused_imports)]` on by default
ソースコード
use std::cmp::Reverse; use std::collections::VecDeque; fn main() { let mut sc = Scanner::new(); let t = 1; for _ in 0..t { solve(&mut sc); } } fn solve(sc:&mut Scanner) { let n = sc.usize(); let la = (1..n).map(|_| (sc.usize(), sc.usize1())).collect::<Vec<_>>(); let mut g = vec![vec![]; n]; for (i, &(l, a)) in la.iter().enumerate() { g[a].push((i+1, l)); } let dist = bfs(0, n, &g); let mut d = dist.iter().filter_map(|&x| x).collect::<Vec<_>>(); d.sort(); let q = sc.usize(); for _ in 0..q { let t = sc.u8(); match t { 1 => { let x = sc.usize(); let index = upper_bound(&d, x); println!("{}", index); } 2 => { let y = sc.usize1(); if let Some(dist) = dist[y] { println!("{}", dist); } else { println!("-1"); } } _ => unreachable!() } } } fn upper_bound<T: Ord>(v: &Vec<T>, x: T) -> usize { let mut l = 0; let mut r = v.len(); while l < r { let m = (l + r) / 2; if v[m] <= x { l = m + 1; } else { r = m; } } l } fn bfs(s:usize, n:usize, g:&Vec<Vec<(usize, usize)>>) -> Vec<Option<usize>> { let mut q = VecDeque::new(); q.push_back(s); let mut dist = vec![None; n]; dist[s] = Some(0); while let Some(v) = q.pop_front() { for &(u, c) in g[v].iter() { if dist[u] >= dist[v].max(Some(c)) { continue } dist[u] = dist[v].max(Some(c)); q.push_back(u); } } dist } struct Scanner { s : std::collections::VecDeque<String> } #[allow(unused)] impl Scanner { fn new() -> Self { use std::io::Read; let mut s = String::new(); std::io::stdin().read_to_string(&mut s).unwrap(); Self { s : s.split_whitespace().map(|s| s.to_string()).collect() } } fn reload(&mut self) -> () { use std::io::Read; let mut s = String::new(); std::io::stdin().read_to_string(&mut s).unwrap(); self.s = s.split_whitespace().map(|s| s.to_string()).collect(); } fn usize(&mut self) -> usize { self.input() } fn usize1(&mut self) -> usize { self.input::<usize>() - 1 } fn isize(&mut self) -> isize { self.input() } fn i32(&mut self) -> i32 { self.input() } fn i64(&mut self) -> i64 { self.input() } fn i128(&mut self) -> i128 { self.input() } fn u8(&mut self) -> u8 { self.input() } fn u32(&mut self) -> u32 { self.input() } fn u64(&mut self) -> u64 { self.input() } fn u128(&mut self) -> u128 { self.input() } fn edge(&mut self) -> (usize, usize) { (self.usize1(), self.usize1()) } fn edges(&mut self, m : usize) -> Vec<(usize, usize)> { let mut e = Vec::with_capacity(m); for _ in 0..m { e.push(self.edge()); } e } fn wedge<T:std::str::FromStr>(&mut self) -> (usize, usize, T) { (self.usize1(), self.usize1(), self.input()) } fn wedges<T:std::str::FromStr>(&mut self, m : usize) -> Vec<(usize, usize, T)> { let mut e = Vec::with_capacity(m); for _ in 0..m { e.push(self.wedge()); } e } fn input<T>(&mut self) -> T where T: std::str::FromStr { if self.s.is_empty() { self.reload(); } if let Some(head) = self.s.pop_front() { head.parse::<T>().ok().unwrap() } else { panic!() } } fn tuple<T, U>(&mut self) -> (T, U) where T: std::str::FromStr, U: std::str::FromStr { (self.input(), self.input()) } fn vec<T>(&mut self, n: usize) -> Vec<T> where T: std::str::FromStr { if self.s.is_empty() { self.reload(); } self.s.drain(..n).map(|s| s.parse::<T>().ok().unwrap() ).collect::<Vec<T>>() } fn nvec<T>(&mut self) -> Vec<T> where T: std::str::FromStr { let n : usize = self.input(); self.vec(n) } fn chars(&mut self) -> Vec<char> { let s : String = self.input(); s.chars().collect() } fn bytes(&mut self) -> Vec<u8> { let s : String = self.input(); s.bytes().collect() } }