結果
| 問題 |
No.483 マッチ並べ
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2017-02-12 22:52:17 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
AC
|
| 実行時間 | 2 ms / 2,000 ms |
| コード長 | 3,870 bytes |
| コンパイル時間 | 18,237 ms |
| コンパイル使用メモリ | 377,840 KB |
| 実行使用メモリ | 5,248 KB |
| 最終ジャッジ日時 | 2024-12-29 17:04:51 |
| 合計ジャッジ時間 | 17,725 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 53 |
コンパイルメッセージ
warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
--> src/main.rs:112:62
|
112 | Err(why) => panic!("error in read_line: {}", why.description()),
| ^^^^^^^^^^^
|
= note: `#[warn(deprecated)]` on by default
ソースコード
use std::io::{self, Stdin};
use std::str::{self, FromStr};
use std::error::Error;
use std::thread;
use std::collections::*;
fn exec() {
let mut sc = Scanner::new();
let n: usize = sc.ne();
let mut edge = vec![(0, 0); n];
let mut num = BTreeMap::new();
for i in 0..n {
let y1 = sc.ne::<usize>() - 1;
let x1 = sc.ne::<usize>() - 1;
let y2 = sc.ne::<usize>() - 1;
let x2 = sc.ne::<usize>() - 1;
let n1 = y1 * 100 + x1;
let n2 = y2 * 100 + x2;
edge[i] = (n1, n2);
num.insert(n1, 0);
num.insert(n2, 0);
}
let m = num.len();
let mut t = 0;
for (_, val) in num.iter_mut() {
*val = t;
t += 1;
}
let mut adj = vec![Vec::new(); n + m];
for i in 0..n {
let u = num[&edge[i].0];
let v = num[&edge[i].1];
adj[i].push(n + u);
adj[i].push(n + v);
adj[n + u].push(i);
adj[n + v].push(i);
}
let ans = match bimatch(&adj, n) {
val if val == n => "YES",
_ => "NO",
};
println!("{}", ans);
}
fn bimatch(adj: &Vec<Vec<usize>>, ln: usize) -> usize {
fn dfs(cur: usize,
adj: &Vec<Vec<usize>>,
mut match_to: &mut Vec<Option<usize>>,
mut used: &mut Vec<bool>)
-> bool {
for &nxt in &adj[cur] {
if used[nxt] {
continue;
}
used[nxt] = true;
let assign = match match_to[nxt] {
Some(v) => dfs(v, &adj, &mut match_to, &mut used),
None => true,
};
if assign {
match_to[cur] = Some(nxt);
match_to[nxt] = Some(cur);
return true;
}
}
false
}
let n = adj.len();
let mut match_to: Vec<Option<usize>> = vec![None; n];
let mut res = 0;
for i in 0..ln {
if match_to[i] != None {
continue;
}
let mut used = vec![false; n];
if dfs(i, &adj, &mut match_to, &mut used) {
res += 1;
}
}
res
}
fn main() {
const DEFAULT_STACK: usize = 16 * 1024 * 1024;
let builder = thread::Builder::new();
let th = builder.stack_size(DEFAULT_STACK);
let handle = th.spawn(|| { exec(); }).unwrap();
let _ = handle.join();
}
#[allow(dead_code)]
struct Scanner {
stdin: Stdin,
id: usize,
buf: Vec<u8>,
}
#[allow(dead_code)]
impl Scanner {
fn new() -> Scanner {
Scanner {
stdin: io::stdin(),
id: 0,
buf: Vec::new(),
}
}
fn next_line(&mut self) -> Option<String> {
let mut res = String::new();
match self.stdin.read_line(&mut res) {
Ok(0) => return None,
Ok(_) => Some(res),
Err(why) => panic!("error in read_line: {}", why.description()),
}
}
fn next<T: FromStr>(&mut self) -> Option<T> {
while self.buf.len() == 0 {
self.buf = match self.next_line() {
Some(r) => {
self.id = 0;
r.trim().as_bytes().to_owned()
}
None => return None,
};
}
let l = self.id;
assert!(self.buf[l] != b' ');
let n = self.buf.len();
let mut r = l;
while r < n && self.buf[r] != b' ' {
r += 1;
}
let res = match str::from_utf8(&self.buf[l..r]).ok().unwrap().parse::<T>() {
Ok(s) => Some(s),
Err(_) => panic!("parse error"),
};
while r < n && self.buf[r] == b' ' {
r += 1;
}
if r == n {
self.buf.clear();
} else {
self.id = r;
}
res
}
fn ne<T: FromStr>(&mut self) -> T {
self.next::<T>().unwrap()
}
}