結果
問題 | No.2427 Tree Distance Two |
ユーザー |
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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 |
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ファイルパターン | 結果 |
---|---|
other | AC * 35 |
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
#![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())}}}}