結果

問題 No.977 アリス仕掛けの摩天楼
ユーザー ziita
提出日時 2020-02-02 16:33:15
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 31 ms / 2,000 ms
コード長 4,776 bytes
コンパイル時間 14,571 ms
コンパイル使用メモリ 380,060 KB
実行使用メモリ 9,728 KB
最終ジャッジ日時 2024-09-18 21:14:00
合計ジャッジ時間 13,468 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge3
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ファイルパターン 結果
other AC * 26
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ソースコード

diff # 

#![allow(unused_imports)]
#![allow(non_snake_case, unused)]

use std::cmp::*;
use std::collections::*;
use std::ops::*;

macro_rules! eprint {
	($($t:tt)*) => {{
		use ::std::io::Write;
		let _ = write!(::std::io::stderr(), $($t)*);
	}};
}
macro_rules! eprintln {
	() => { eprintln!(""); };
	($($t:tt)*) => {{
		use ::std::io::Write;
		let _ = writeln!(::std::io::stderr(), $($t)*);
	}};
}
macro_rules! dbg {
	($v:expr) => {{
		let val = $v;
		eprintln!("[{}:{}] {} = {:?}", file!(), line!(), stringify!($v), val);
		val
	}}
}

macro_rules! mat {
	($($e:expr),*) => { Vec::from(vec![$($e),*]) };
	($($e:expr,)*) => { Vec::from(vec![$($e),*]) };
	($e:expr; $d:expr) => { Vec::from(vec![$e; $d]) };
	($e:expr; $d:expr $(; $ds:expr)+) => { Vec::from(vec![mat![$e $(; $ds)*]; $d]) };
}

macro_rules! ok {
	($a:ident$([$i:expr])*.$f:ident()$(@$t:ident)*) => {
		$a$([$i])*.$f($($t),*)
	};
	($a:ident$([$i:expr])*.$f:ident($e:expr$(,$es:expr)*)$(@$t:ident)*) => { {
		let t = $e;
		ok!($a$([$i])*.$f($($es),*)$(@$t)*@t)
	} };
}

pub fn readln() -> String {
	let mut line = String::new();
	::std::io::stdin().read_line(&mut line).unwrap_or_else(|e| panic!("{}", e));
	line
}

macro_rules! read {
	($($t:tt),*; $n:expr) => {{
		let stdin = ::std::io::stdin();
		let ret = ::std::io::BufRead::lines(stdin.lock()).take($n).map(|line| {
			let line = line.unwrap();
			let mut it = line.split_whitespace();
			_read!(it; $($t),*)
		}).collect::<Vec<_>>();
		ret
	}};
	($($t:tt),*) => {{
		let line = readln();
		let mut it = line.split_whitespace();
		_read!(it; $($t),*)
	}};
}

macro_rules! _read {
	($it:ident; [char]) => {
		_read!($it; String).chars().collect::<Vec<_>>()
	};
	($it:ident; [u8]) => {
		Vec::from(_read!($it; String).into_bytes())
	};
	($it:ident; usize1) => {
		$it.next().unwrap_or_else(|| panic!("input mismatch")).parse::<usize>().unwrap_or_else(|e| panic!("{}", e)) - 1
	};
	($it:ident; [usize1]) => {
		$it.map(|s| s.parse::<usize>().unwrap_or_else(|e| panic!("{}", e)) - 1).collect::<Vec<_>>()
	};
	($it:ident; [$t:ty]) => {
		$it.map(|s| s.parse::<$t>().unwrap_or_else(|e| panic!("{}", e))).collect::<Vec<_>>()
	};
	($it:ident; $t:ty) => {
		$it.next().unwrap_or_else(|| panic!("input mismatch")).parse::<$t>().unwrap_or_else(|e| panic!("{}", e))
	};
	($it:ident; $($t:tt),+) => {
		($(_read!($it; $t)),*)
	};
}

pub fn main() {
	let _ = ::std::thread::Builder::new().name("run".to_string()).stack_size(32 * 1024 * 1024).spawn(run).unwrap().join();
}

const MOD: usize = 1_000_000_007;
const INF: usize = std::usize::MAX/2;

pub trait SetMinMax {
	fn setmin(&mut self, v: Self) -> bool;
	fn setmax(&mut self, v: Self) -> bool;
}
impl<T> SetMinMax for T where T: PartialOrd {
	fn setmin(&mut self, v: T) -> bool {
		*self > v && { *self = v; true }
	}
	fn setmax(&mut self, v: T) -> bool {
		*self < v && { *self = v; true }
	}
}

pub struct UnionFind {
    data: Vec<i32>,
}

impl UnionFind {
    /// Creates a object with n disjoint sets. `i`-th set is `{ i }`.
    pub fn new(n: usize) -> UnionFind {
        UnionFind { data: vec![-1; n] }
    }

    /// Unite a set including `x` and another set including y into one.
    /// Returns `true` only if they were in different set.
    pub fn unite(&mut self, x: usize, y: usize) -> bool {
        let x = self.root(x);
        let y = self.root(y);
        if x != y {
            let (x, y) = if self.data[x] <= self.data[y] {
                (x, y)
            } else {
                (y, x)
            };
            self.data[x] += self.data[y];
            self.data[y] = x as i32;
        }
        x != y
    }

    /// Returns `true` only if `x` and `y` are in a same set.
    pub fn same(&mut self, x: usize, y: usize) -> bool {
        self.root(x) == self.root(y)
    }

    /// Returns the number of elements of a set including `x`.
    pub fn size(&mut self, x: usize) -> u32 {
        let r = self.root(x);
        (-self.data[r]) as u32
    }

    /// internal method to return representative element of a set including `x`.
    pub fn root(&mut self, x: usize) -> usize {
        if self.data[x] < 0 {
            x
        } else {
            let nx = self.data[x] as usize;
            let r = self.root(nx);
            self.data[x] = r as i32;
            r
        }
    }
}

fn solve() {
	let n = read!(usize);
	let e = read!([usize];n-1);
	let mut v = vec![0;n];
	let mut uf = UnionFind::new(n);
	for i in e {
		v[i[0]] += 1;
		v[i[1]] += 1;
		uf.unite(i[0],i[1]);
	}
	let mut s = (0..n).map(|x| uf.root(x)).collect::<HashSet<usize>>();
	let size = s.len();
	if size==1 {
		println!("Bob");
	}
	else if size==2 {
		if let Some(k) = v.iter().position(|x| *x>2){
			println!("Alice");
		}
		else {
			println!("Bob");
		}
	}
	else {
		println!("Alice");
	}
}

fn run() {
    solve();
}
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