結果

問題 No.1639 最小通信路
コンテスト
ユーザー fukafukatani
提出日時 2021-08-06 22:45:59
言語 Rust
(1.83.0 + proconio)
結果
RE  
実行時間 -
コード長 2,577 bytes
コンパイル時間 14,196 ms
コンパイル使用メモリ 389,464 KB
実行使用メモリ 6,948 KB
最終ジャッジ日時 2024-09-17 02:58:55
合計ジャッジ時間 14,523 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge4
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
sample AC * 2
other AC * 21 RE * 22
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: variable `total` is assigned to, but never used
  --> src/main.rs:21:13
   |
21 |     let mut total = 0;
   |             ^^^^^
   |
   = note: consider using `_total` instead
   = note: `#[warn(unused_variables)]` on by default

warning: unused variable: `i`
  --> src/main.rs:23:9
   |
23 |     for i in 0..n * (n - 1) / 2 {
   |         ^ help: if this is intentional, prefix it with an underscore: `_i`

warning: method `get_size` is never used
  --> src/main.rs:79:8
   |
56 | impl UnionFindTree {
   | ------------------ method in this implementation
...
79 |     fn get_size(&mut self, x: usize) -> usize {
   |        ^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

ソースコード

diff # 

#![allow(unused_imports)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;
use std::ops::Bound::*;

#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}

fn main() {
    let n = read::<usize>();
    let mut uft = UnionFindTree::new(n);
    let mut total = 0;
    let mut max = 0;
    for i in 0..n * (n - 1) / 2 {
        let v = read_vec::<i128>();
        let (a, b, c) = (v[0] as usize - 1, v[1] as usize - 1, v[2]);
        if uft.same(a, b) {
            continue;
        }
        uft.unite(a, b);
        total += c;
        max = c;
    }
    println!("{}", max);
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}

#[derive(Debug, Clone)]
struct UnionFindTree {
    parent: Vec<isize>,
    size: Vec<usize>,
    height: Vec<u64>,
}

impl UnionFindTree {
    fn new(n: usize) -> UnionFindTree {
        UnionFindTree {
            parent: vec![-1; n],
            size: vec![1usize; n],
            height: vec![0u64; n],
        }
    }

    fn find(&mut self, index: usize) -> usize {
        if self.parent[index] == -1 {
            return index;
        }
        let idx = self.parent[index] as usize;
        let ret = self.find(idx);
        self.parent[index] = ret as isize;
        ret
    }

    fn same(&mut self, x: usize, y: usize) -> bool {
        self.find(x) == self.find(y)
    }

    fn get_size(&mut self, x: usize) -> usize {
        let idx = self.find(x);
        self.size[idx]
    }

    fn unite(&mut self, index0: usize, index1: usize) -> bool {
        let a = self.find(index0);
        let b = self.find(index1);
        if a == b {
            false
        } else {
            if self.height[a] > self.height[b] {
                self.parent[b] = a as isize;
                self.size[a] += self.size[b];
            } else if self.height[a] < self.height[b] {
                self.parent[a] = b as isize;
                self.size[b] += self.size[a];
            } else {
                self.parent[b] = a as isize;
                self.size[a] += self.size[b];
                self.height[a] += 1;
            }
            true
        }
    }
}
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