結果
| 問題 |
No.1390 Get together
|
| コンテスト | |
| ユーザー |
uw_yu1rabbit
|
| 提出日時 | 2021-03-14 15:03:07 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
AC
|
| 実行時間 | 82 ms / 2,000 ms |
| コード長 | 2,072 bytes |
| コンパイル時間 | 13,480 ms |
| コンパイル使用メモリ | 405,844 KB |
| 実行使用メモリ | 17,248 KB |
| 最終ジャッジ日時 | 2024-11-06 05:00:48 |
| 合計ジャッジ時間 | 17,368 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 29 |
ソースコード
#[allow(dead_code)]
#[allow(unused_imports)]
fn read<T: std::str::FromStr>() -> T {
use std::io::*;
let stdin = stdin();
let stdin = stdin.lock();
let token: String = stdin
.bytes()
.map(|c| c.expect("failed to read char") as char)
.skip_while(|c| c.is_whitespace())
.take_while(|c| !c.is_whitespace())
.collect();
token.parse().ok().expect("failed to parse token")
}
use std::mem::*;
struct UnionFind {
par: Vec<i64>,
}
#[allow(dead_code)]
impl UnionFind {
pub fn new(n: usize) -> Self {
let par = (0..n).map(|_| -1).collect();
Self{par}
}
pub fn root(&mut self, x: usize) -> i64 {
if self.par[x] < 0{
x as i64
}else{
self.par[x] = self.root(self.par[x] as usize);
self.par[x]
}
}
pub fn same(&mut self, x: usize, y: usize) -> bool {
self.root(x) == self.root(y)
}
pub fn merge(&mut self, x: usize, y: usize) -> bool {
let mut _x: i64 = self.root(x);
let mut _y: i64 = self.root(y);
if _x == _y {
return false;
}
if self.par[_x as usize] > self.par[_y as usize] {
swap(&mut _x, &mut _y);
}
self.par[_x as usize] += self.par[_y as usize];
self.par[_y as usize] = _x as i64;
return true;
}
pub fn size(&mut self, x: usize) -> i64 {
(self.par[x]) as i64 * -1
}
}
fn main(){
let n:usize = read();
let m:usize = read();
let bc:Vec<(usize,usize)> = (0..n).map(|_| (read(),read())).collect();
let mut rec = vec![Vec::new();n];
let mut uf = UnionFind::new(m);
for i in 0..n {
rec[bc[i].1 - 1].push(bc[i].0 - 1);
}
let mut ans = 0;
for i in 0..n {
if rec[i].len() == 0 {
continue;
}
let key = rec[i][0];
for j in 0..rec[i].len() {
if !uf.same(key,rec[i][j]) {
ans += 1;
uf.merge(key,rec[i][j]);
}
}
}
println!("{}",ans);
}
uw_yu1rabbit