結果

問題 No.2072 Anatomy
ユーザー fukafukatanifukafukatani
提出日時 2022-09-17 10:51:48
言語 Rust
(1.72.1)
結果
AC  
実行時間 65 ms / 2,000 ms
コード長 2,743 bytes
コンパイル時間 2,759 ms
コンパイル使用メモリ 156,764 KB
実行使用メモリ 10,608 KB
最終ジャッジ日時 2023-08-23 17:34:04
合計ジャッジ時間 5,477 ms
ジャッジサーバーID
(参考情報)
judge12 / judge11
このコードへのチャレンジ(β)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 1 ms
4,376 KB
testcase_01 AC 1 ms
4,376 KB
testcase_02 AC 1 ms
4,376 KB
testcase_03 AC 1 ms
4,376 KB
testcase_04 AC 1 ms
4,376 KB
testcase_05 AC 1 ms
4,376 KB
testcase_06 AC 1 ms
4,376 KB
testcase_07 AC 1 ms
4,380 KB
testcase_08 AC 57 ms
9,320 KB
testcase_09 AC 56 ms
9,496 KB
testcase_10 AC 56 ms
8,040 KB
testcase_11 AC 60 ms
9,592 KB
testcase_12 AC 46 ms
7,308 KB
testcase_13 AC 63 ms
10,324 KB
testcase_14 AC 39 ms
6,736 KB
testcase_15 AC 37 ms
7,204 KB
testcase_16 AC 65 ms
10,232 KB
testcase_17 AC 60 ms
10,116 KB
testcase_18 AC 31 ms
6,424 KB
testcase_19 AC 65 ms
10,504 KB
testcase_20 AC 65 ms
10,448 KB
testcase_21 AC 57 ms
8,380 KB
testcase_22 AC 65 ms
10,476 KB
testcase_23 AC 58 ms
8,368 KB
testcase_24 AC 56 ms
8,372 KB
testcase_25 AC 64 ms
10,516 KB
testcase_26 AC 1 ms
4,376 KB
testcase_27 AC 58 ms
8,276 KB
testcase_28 AC 56 ms
10,608 KB
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 variable: `i`
  --> Main.rs:22:9
   |
22 |     for i in 0..m {
   |         ^ help: if this is intentional, prefix it with an underscore: `_i`
   |
   = note: `#[warn(unused_variables)]` on by default

warning: associated function `same` is never used
  --> Main.rs:82:8
   |
82 |     fn same(&mut self, x: usize, y: usize) -> bool {
   |        ^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: associated function `get_size` is never used
  --> Main.rs:86:8
   |
86 |     fn get_size(&mut self, x: usize) -> usize {
   |        ^^^^^^^^

warning: 3 warnings emitted

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 v = read_vec::<usize>();
    let (n, m) = (v[0], v[1]);
    let mut edges = vec![];
    for i in 0..m {
        let v = read_vec::<usize>();
        let (a, b) = (v[0] - 1, v[1] - 1);
        edges.push((a, b));
    }
    edges.reverse();

    let mut uft = UnionFindTree::new(n);
    let mut counts = vec![0; n];

    for (aa, bb) in edges {
        let a = uft.find(aa);
        let b = uft.find(bb);
        uft.unite(a, b);
        let o = uft.find(a);
        counts[o] = max(counts[a], counts[b]) + 1;
    }

    println!("{}", counts.iter().max().unwrap());
}

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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