結果

問題 No.1340 おーじ君をさがせ
ユーザー fukafukatani
提出日時 2021-01-15 22:41:50
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 273 ms / 2,000 ms
コード長 1,767 bytes
コンパイル時間 11,322 ms
コンパイル使用メモリ 379,664 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-11-27 23:16:57
合計ジャッジ時間 16,439 ms
ジャッジサーバーID
(参考情報)
judge4 / judge3
このコードへのチャレンジ
(要ログイン)
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
コンパイルメッセージ
warning: type `mat` should have an upper camel case name
  --> src/main.rs:18:6
   |
18 | type mat = Vec<Vec<i64>>;
   |      ^^^ help: convert the identifier to upper camel case: `Mat`
   |
   = note: `#[warn(non_camel_case_types)]` on by default

warning: unused variable: `i`
  --> src/main.rs:58:9
   |
58 |     for i in 0..m {
   |         ^ help: if this is intentional, prefix it with an underscore: `_i`
   |
   = note: `#[warn(unused_variables)]` on by default

ソースコード

diff #
プレゼンテーションモードにする

#![allow(unused_imports)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;
use std::ops::Bound::*;
#[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()
})*
};
}
type mat = Vec<Vec<i64>>;
fn mat_zeros(n: usize, m: usize) -> mat {
vec![vec![0i64; m]; n]
}
fn matmul(a: &mat, b: &mat) -> mat {
let mut c = mat_zeros(a.len(), b[0].len());
for i in 0..a.len() {
for k in 0..b.len() {
for j in 0..b[0].len() {
c[i][j] += a[i][k] * b[k][j];
c[i][j] = min(1, c[i][j]);
}
}
}
c
}
fn matpow(a: &mat, n: u64) -> mat {
let mut b = mat_zeros(a.len(), a.len());
for i in 0..a.len() {
b[i][i] = 1;
}
let mut n = n;
let mut a: mat = a.clone();
while n > 0 {
if n & 1 == 1 {
b = matmul(&a, &b);
}
a = matmul(&a, &a);
n >>= 1;
}
b
}
fn main() {
let v = read_vec::<u64>();
let (n, m, t) = (v[0] as usize, v[1] as usize, v[2]);
let mut c = mat_zeros(n, n);
for i in 0..m {
let v = read_vec::<usize>();
let (a, b) = (v[0], v[1]);
c[a][b] = 1;
}
let c = matpow(&c, t);
let ans = c[0].iter().sum::<i64>();
println!("{}", ans);
}
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()
}
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