結果

問題 No.1340 おーじ君をさがせ
ユーザー ikd
提出日時 2021-01-15 22:40:43
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 274 ms / 2,000 ms
コード長 2,590 bytes
コンパイル時間 14,453 ms
コンパイル使用メモリ 395,220 KB
実行使用メモリ 7,168 KB
最終ジャッジ日時 2024-11-27 23:15:00
合計ジャッジ時間 20,981 ms
ジャッジサーバーID
(参考情報)
judge1 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 59
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

fn main() {
let stdin = std::io::stdin();
let mut rd = ProconReader::new(stdin.lock());
let n: usize = rd.get();
let m: usize = rd.get();
let t: u64 = rd.get();
let mut a = vec![vec![0; n]; n];
for _ in 0..m {
let u: usize = rd.get();
let v: usize = rd.get();
a[v][u] = 1;
}
let mut b = vec![vec![vec![0; n]; n]; 64];
b[0] = a;
for o in 0..63 {
for i in 0..n {
for j in 0..n {
for k in 0..n {
b[o + 1][i][j] |= b[o][i][k] & b[o][k][j];
}
}
}
}
let mut y = vec![0; n];
y[0] = 1;
for o in 0..64 {
if t >> o & 1 == 1 {
let mut nxt = vec![0; n];
for i in 0..n {
for j in 0..n {
nxt[i] |= b[o][i][j] & y[j];
}
}
y = nxt;
}
}
let ans = y.iter().sum::<usize>();
println!("{}", ans);
}
pub struct ProconReader<R> {
r: R,
line: String,
i: usize,
}
impl<R: std::io::BufRead> ProconReader<R> {
pub fn new(reader: R) -> Self {
Self {
r: reader,
line: String::new(),
i: 0,
}
}
pub fn get<T>(&mut self) -> T
where
T: std::str::FromStr,
<T as std::str::FromStr>::Err: std::fmt::Debug,
{
self.skip_blanks();
assert!(self.i < self.line.len());
assert_ne!(&self.line[self.i..=self.i], " ");
let line = &self.line[self.i..];
let end = line.find(' ').unwrap_or_else(|| line.len());
let s = &line[..end];
self.i += end;
s.parse()
.unwrap_or_else(|_| panic!("parse error `{}`", self.line))
}
fn skip_blanks(&mut self) {
loop {
let start = self.line[self.i..].find(|ch| ch != ' ');
match start {
Some(j) => {
self.i += j;
break;
}
None => {
self.line.clear();
self.i = 0;
let num_bytes = self.r.read_line(&mut self.line).unwrap();
assert!(num_bytes > 0, "reached EOF :(");
self.line = self.line.trim_end_matches(&['\r', '\n'][..]).to_string();
}
}
}
}
pub fn get_vec<T>(&mut self, n: usize) -> Vec<T>
where
T: std::str::FromStr,
<T as std::str::FromStr>::Err: std::fmt::Debug,
{
(0..n).map(|_| self.get()).collect()
}
}
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