結果
| 問題 |
No.977 アリス仕掛けの摩天楼
|
| ユーザー |
fukafukatani
|
| 提出日時 | 2020-01-31 21:41:54 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
AC
|
| 実行時間 | 30 ms / 2,000 ms |
| コード長 | 2,698 bytes |
| コンパイル時間 | 15,299 ms |
| コンパイル使用メモリ | 400,732 KB |
| 実行使用メモリ | 5,376 KB |
| 最終ジャッジ日時 | 2024-09-17 07:30:18 |
| 合計ジャッジ時間 | 14,995 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 26 |
コンパイルメッセージ
warning: unused variable: `i`
--> src/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
--> src/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
ソースコード
#![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
}
}
}
fukafukatani