結果
| 問題 |
No.1103 Directed Length Sum
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2020-07-03 21:48:46 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 3,152 bytes |
| コンパイル時間 | 26,852 ms |
| コンパイル使用メモリ | 378,684 KB |
| 実行使用メモリ | 185,480 KB |
| 最終ジャッジ日時 | 2024-09-17 00:08:48 |
| 合計ジャッジ時間 | 26,586 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge6 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 21 WA * 1 |
ソースコード
#[allow(unused_imports)]
use std::cmp::*;
#[allow(unused_imports)]
use std::collections::*;
use std::io::{Write, BufWriter};
// https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
macro_rules! input {
($($r:tt)*) => {
let stdin = std::io::stdin();
let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
let mut next = move || -> String{
bytes
.by_ref()
.map(|r|r.unwrap() as char)
.skip_while(|c|c.is_whitespace())
.take_while(|c|!c.is_whitespace())
.collect()
};
input_inner!{next, $($r)*}
};
}
macro_rules! input_inner {
($next:expr) => {};
($next:expr, ) => {};
($next:expr, $var:ident : $t:tt $($r:tt)*) => {
let $var = read_value!($next, $t);
input_inner!{$next $($r)*}
};
}
macro_rules! read_value {
($next:expr, [graph1; $len:expr]) => {{
let mut g = vec![vec![]; $len];
let ab = read_value!($next, [(usize1, usize1)]);
for (a, b) in ab {
g[a].push(b);
g[b].push(a);
}
g
}};
($next:expr, ( $($t:tt),* )) => {
( $(read_value!($next, $t)),* )
};
($next:expr, [ $t:tt ; $len:expr ]) => {
(0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
};
($next:expr, chars) => {
read_value!($next, String).chars().collect::<Vec<char>>()
};
($next:expr, usize1) => (read_value!($next, usize) - 1);
($next:expr, [ $t:tt ]) => {{
let len = read_value!($next, usize);
read_value!($next, [$t; len])
}};
($next:expr, $t:ty) => ($next().parse::<$t>().expect("Parse error"));
}
#[allow(unused)]
macro_rules! debug {
($($format:tt)*) => (write!(std::io::stderr(), $($format)*).unwrap());
}
#[allow(unused)]
macro_rules! debugln {
($($format:tt)*) => (writeln!(std::io::stderr(), $($format)*).unwrap());
}
fn dfs(v: usize, ch: &[Vec<usize>], mem: &mut [(i64, i64)]) -> (i64, i64) {
let mut sz = 1;
let mut tot = 0;
for &w in &ch[v] {
let (a, b) = dfs(w, ch, mem);
sz += a;
tot += b + a;
}
mem[v] = (sz, tot);
(sz, tot)
}
fn solve() {
let out = std::io::stdout();
let mut out = BufWriter::new(out.lock());
macro_rules! puts {
($($format:tt)*) => (let _ = write!(out,$($format)*););
}
input! {
n: usize,
ab: [(usize1, usize1); n - 1],
}
let mut ch = vec![vec![]; n];
let mut indeg = vec![0; n];
for (a, b) in ab {
ch[a].push(b);
indeg[b] += 1;
}
let mut r = 0;
for i in 0..n {
if indeg[i] == 0 {
r = i;
break;
}
}
let mut mem = vec![(0, 0); n];
dfs(r, &ch, &mut mem);
let mut tot = 0;
for i in 0..n {
tot += mem[i].1;
}
puts!("{}\n", tot);
}
fn main() {
// In order to avoid potential stack overflow, spawn a new thread.
let stack_size = 104_857_600; // 100 MB
let thd = std::thread::Builder::new().stack_size(stack_size);
thd.spawn(|| solve()).unwrap().join().unwrap();
}