結果
| 問題 |
No.2325 Skill Tree
|
| コンテスト | |
| ユーザー |
naut3
|
| 提出日時 | 2023-09-30 14:06:06 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
AC
|
| 実行時間 | 152 ms / 3,000 ms |
| コード長 | 2,969 bytes |
| コンパイル時間 | 18,095 ms |
| コンパイル使用メモリ | 384,380 KB |
| 実行使用メモリ | 19,072 KB |
| 最終ジャッジ日時 | 2024-07-23 08:09:47 |
| 合計ジャッジ時間 | 25,246 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge1 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 36 |
ソースコード
#![allow(non_snake_case, unused_imports, unused_must_use)]
use std::io::{self, prelude::*};
use std::str;
fn main() {
let (stdin, stdout) = (io::stdin(), io::stdout());
let mut scan = Scanner::new(stdin.lock());
let mut out = io::BufWriter::new(stdout.lock());
macro_rules! input {
($T: ty) => {
scan.token::<$T>()
};
($T: ty, $N: expr) => {
(0..$N).map(|_| scan.token::<$T>()).collect::<Vec<_>>()
};
}
let N = input!(usize);
let mut graph = vec![vec![]; N];
for i in 1..N {
let l = input!(usize);
let a = input!(usize) - 1;
graph[a].push((i, l));
}
let mut lower = vec![0; N];
let mut seen = vec![false; N];
let mut q = std::collections::VecDeque::new();
q.push_front(0);
seen[0] = true;
while let Some(now) = q.pop_front() {
for &(nxt, l) in graph[now].iter() {
lower[nxt] = std::cmp::max(lower[nxt], std::cmp::max(l, lower[now]));
q.push_back(nxt);
seen[nxt] = true;
}
}
// eprintln!(
// "{}",
// lower
// .iter()
// .map(|x| x.to_string())
// .collect::<Vec<_>>()
// .join(" ")
// );
let lower_sorted = {
let mut L = vec![];
for i in 0..N {
if seen[i] {
L.push(lower[i]);
}
}
L.sort();
L
};
let Q = input!(usize);
for _ in 0..Q {
let t = input!(usize);
let x = input!(usize);
if t == 1 {
let mut ok = 0;
let mut ng = lower_sorted.len();
while ng - ok > 1 {
let m = (ok + ng) / 2;
if lower_sorted[m] <= x {
ok = m;
} else {
ng = m;
}
}
writeln!(out, "{}", ok + 1);
} else {
if !seen[x - 1] {
writeln!(out, "-1");
} else {
writeln!(out, "{}", lower[x - 1]);
}
}
}
}
struct Scanner<R> {
reader: R,
buf_str: Vec<u8>,
buf_iter: str::SplitWhitespace<'static>,
}
impl<R: BufRead> Scanner<R> {
fn new(reader: R) -> Self {
Self {
reader,
buf_str: vec![],
buf_iter: "".split_whitespace(),
}
}
fn token<T: str::FromStr>(&mut self) -> T {
loop {
if let Some(token) = self.buf_iter.next() {
return token.parse().ok().expect("Failed parse");
}
self.buf_str.clear();
self.reader
.read_until(b'\n', &mut self.buf_str)
.expect("Failed read");
self.buf_iter = unsafe {
let slice = str::from_utf8_unchecked(&self.buf_str);
std::mem::transmute(slice.split_whitespace())
}
}
}
}
naut3