結果

問題 No.2427 Tree Distance Two
ユーザー naut3
提出日時 2023-08-19 20:44:50
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 203 ms / 2,000 ms
コード長 1,836 bytes
コンパイル時間 22,181 ms
コンパイル使用メモリ 397,856 KB
実行使用メモリ 47,224 KB
最終ジャッジ日時 2024-11-29 16:28:37
合計ジャッジ時間 26,247 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
other AC * 35
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: unused macro definition: `input_line`
  --> src/main.rs:15:18
   |
15 |     macro_rules! input_line {
   |                  ^^^^^^^^^^
   |
   = note: `#[warn(unused_macros)]` on by default

warning: unused `Result` that must be used
  --> src/main.rs:43:5
   |
43 |     writeln!(out, "{}", ans.iter().map(|x| x.to_string()).collect::<Vec<_>>().join("\n"));
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled
   = note: `#[warn(unused_must_use)]` on by default
   = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)

ソースコード

diff #
プレゼンテーションモードにする

#![allow(non_snake_case, unused_imports)]
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>()
};
}
macro_rules! input_line {
($T: ty, $N: expr) => {
(0..$N).map(|_| scan.token::<$T>()).collect::<Vec<_>>()
};
}
let N = input!(usize);
let mut graph = vec![vec![]; N];
for _ in 0..N-1 {
let u = input!(usize) - 1;
let v = input!(usize) - 1;
graph[u].push(v);
graph[v].push(u);
}
let mut ans = vec![0; N];
for i in 0..N {
for &nxt in graph[i].iter() {
ans[i] += graph[nxt].len();
}
ans[i] -= graph[i].len();
}
writeln!(out, "{}", ans.iter().map(|x| x.to_string()).collect::<Vec<_>>().join("\n"));
}
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())
}
}
}
}
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