#758674 (Rust) No.1928 Make a Binary Tree

• 問題: No.1928 Make a Binary Tree
• ユーザー: akakimidori
• 提出日時: 2022-05-06 22:07:39
• 言語: Rust (1.83.0 + proconio)
• 結果: AC
• 実行時間: 115 ms / 3,000 ms
• コード長: 2,364 bytes
• コンパイル時間: 14,307 ms
• コンパイル使用メモリ: 377,280 KB
• 実行使用メモリ: 31,556 KB
• 最終ジャッジ日時: 2024-07-05 23:23:20
• 合計ジャッジ時間: 16,568 ms
• ジャッジサーバーID （参考情報）: judge3 / judge5

ファイルパターン	結果
sample	AC * 3
other	AC * 57

コンパイルメッセージ

warning: unused variable: `i`
  --> src/main.rs:28:14
   |
28 |         for (i, &u) in g[v].iter().enumerate() {
   |              ^ help: if this is intentional, prefix it with an underscore: `_i`
   |
   = note: `#[warn(unused_variables)]` on by default

ソースコード

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use std::collections::*;
fn run() {
    input! {
        n: usize,
        e: [(usize1, usize1); n - 1],
    }
    let mut g = vec![vec![]; n];
    for (a, b) in e {
        g[a].push(b);
        g[b].push(a);
    }
    let mut topo = vec![0];
    for i in 0..n {
        let v = topo[i];
        for u in g[v].clone() {
            g[u].retain(|p| *p != v);
            topo.push(u);
        }
    }
    let mut size = vec![1u32; n];
    let mut h = vec![BinaryHeap::new(); n];
    for &v in topo.iter().rev() {
        if g[v].is_empty() {
            continue;
        }
        let mut pq = BinaryHeap::new();
        for (i, &u) in g[v].iter().enumerate() {
            pq.push(size[u]);
            pq.append(&mut h[u]);
        }
        for _ in 0..2 {
            size[v] += pq.pop().unwrap_or(0);
        }
        h[v] = pq;
    }
    println!("{}", size[0]);
}
fn main() {
    run();
}
// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[macro_export]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}
#[macro_export]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}
#[macro_export]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------
 
 
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