結果

問題 No.977 アリス仕掛けの摩天楼
ユーザー fukafukatanifukafukatani
提出日時 2020-01-31 21:41:54
言語 Rust
(1.77.0)
結果
AC  
実行時間 35 ms / 2,000 ms
コード長 2,698 bytes
コンパイル時間 9,387 ms
コンパイル使用メモリ 175,544 KB
実行使用メモリ 4,996 KB
最終ジャッジ日時 2023-10-17 09:03:23
合計ジャッジ時間 3,364 ms
ジャッジサーバーID
(参考情報)
judge15 / judge13
このコードへのチャレンジ
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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
4,348 KB
testcase_01 AC 1 ms
4,348 KB
testcase_02 AC 0 ms
4,348 KB
testcase_03 AC 1 ms
4,348 KB
testcase_04 AC 1 ms
4,348 KB
testcase_05 AC 1 ms
4,348 KB
testcase_06 AC 1 ms
4,348 KB
testcase_07 AC 1 ms
4,348 KB
testcase_08 AC 1 ms
4,348 KB
testcase_09 AC 1 ms
4,348 KB
testcase_10 AC 1 ms
4,348 KB
testcase_11 AC 1 ms
4,348 KB
testcase_12 AC 1 ms
4,348 KB
testcase_13 AC 4 ms
4,348 KB
testcase_14 AC 3 ms
4,348 KB
testcase_15 AC 4 ms
4,348 KB
testcase_16 AC 3 ms
4,348 KB
testcase_17 AC 3 ms
4,348 KB
testcase_18 AC 9 ms
4,348 KB
testcase_19 AC 10 ms
4,348 KB
testcase_20 AC 16 ms
4,348 KB
testcase_21 AC 26 ms
4,996 KB
testcase_22 AC 32 ms
4,836 KB
testcase_23 AC 34 ms
4,800 KB
testcase_24 AC 33 ms
4,800 KB
testcase_25 AC 35 ms
4,800 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..n - 1 {
   |         ^ help: if this is intentional, prefix it with an underscore: `_i`
   |
   = note: `#[warn(unused_variables)]` on by default

warning: methods `same` and `get_size` are never used
  --> Main.rs:78:8
   |
59 | impl UnionFindTree {
   | ------------------ methods in this implementation
...
78 |     fn same(&mut self, x: usize, y: usize) -> bool {
   |        ^^^^
...
82 |     fn get_size(&mut self, x: usize) -> usize {
   |        ^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: 2 warnings emitted

ソースコード

diff #

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

#[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 count = vec![0; n];
    for i in 0..n - 1 {
        let v = read_vec::<usize>();
        let (u, v) = (v[0], v[1]);
        uft.unite(u, v);
        count[u] += 1;
        count[v] += 1;
    }
    let elem = (0..n).map(|x| uft.find(x)).collect::<HashSet<_>>().len();
    let count_one = count.into_iter().any(|num| num == 1);

    if elem > 2 || (elem == 2 && count_one) {
        println!("Alice");
    } else {
        println!("Bob");
    }
}

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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