結果

問題 No.314 ケンケンパ
ユーザー MasuqaT
提出日時 2019-05-04 21:28:18
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 8 ms / 1,000 ms
コード長 3,338 bytes
コンパイル時間 15,143 ms
コンパイル使用メモリ 379,180 KB
実行使用メモリ 9,728 KB
最終ジャッジ日時 2024-06-23 08:08:04
合計ジャッジ時間 15,441 ms
ジャッジサーバーID
(参考情報)
judge2 / judge4
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 * 17
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: unused `Result` that must be used
   --> src/main.rs:125:5
    |
125 |     write!(writer, "{}", memo[n]);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled
    = note: `#[warn(unused_must_use)]` on by default
    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)

ソースコード

diff #
プレゼンテーションモードにする

use std::io;
use std::io::{BufRead, Write};
macro_rules! input {
(source = $s:expr, $($r:tt)*) => {
let mut iter = $s.split_whitespace();
input_inner!{iter, $($r)*}
};
(stdin = $s:expr, $($r:tt)*) => {
let s = {
let mut s = String::new();
$s.read_to_string(&mut s).unwrap();
s
};
let mut iter = s.split_whitespace();
input_inner!{iter, $($r)*}
};
}
macro_rules! input_inner {
($iter:expr) => {};
($iter:expr, ) => {};
($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
let $var = read_value!($iter, $t);
input_inner!{$iter $($r)*}
};
}
macro_rules! read_value {
($iter:expr, ( $($t:tt),* )) => {
( $(read_value!($iter, $t)),* )
};
($iter:expr, [ $t:tt ; $len:expr ]) => {
(0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
};
($iter:expr, chars) => {
read_value!($iter, String).chars().collect::<Vec<char>>()
};
($iter:expr, usize1) => {
read_value!($iter, usize) - 1
};
($iter:expr, $t:ty) => {
$iter.next().unwrap().parse::<$t>().expect("Parse error")
};
}
#[allow(unused_macros)]
macro_rules! assert_judge {
($method:ident, $input:expr, $expected:expr) => {
{
let input = $input.as_bytes();
let mut output = Vec::new();
$method(&input[..], &mut output);
let output = String::from_utf8(output).expect("Not UTF-8");
assert_eq!($expected, output);
}
};
}
#[allow(unused_macros)]
macro_rules! assert_judge_with_output {
($method:ident, $input:expr) => {
{
let input = $input.as_bytes();
let mut output = Vec::new();
$method(&input[..], &mut output);
String::from_utf8(output).expect("Not UTF-8")
}
};
}
fn main() {
let stdio = io::stdin();
let input = stdio.lock();
let output = io::stdout();
process(input, output);
}
// 1 -> [1] k
// 2 -> [2] kk, kp
// 3 -> [2] kkp, kpk
// 3 -> "2" + 0
// 4 -> [3] kkpk, kpkp, kpkk
// 4 -> "3" + 1, "2" + 1
// 5 -> [4] kkpkk, kkpkp, kpkkp, kpkpk
// 5 -> "4" + 1, "3" + 2, "2" + 2
// 6 -> [5] kkpkkp, kkpkpk, kpkkpk, kpkpkk, kpkpkp
// 6 -> "5" + 1, "4" + 2, "3" + 3, "2" + 3
// 7 -> [7] kkpkkpk, kkpkpkk, kkpkpkpk, kpkkpkk, kpkkpkp, kpkpkkp, kpkpkpk
// 7 -> "6" + 2, "5" + 3, "4" + 4, "3" + 5, "2" + 5
// 8 -> [9] kkpkkpkk, kkpkkpkp, kkpkpkkpk, kkpkpkpk, kpkkpkkp, kpkkpkpk, kpkpkkpk, kpkpkpkk, kpkpkpkp
// q(n) = q(n-3) + q(n-2)
fn process<R, W>(mut reader: R, mut writer: W) -> () where
R: BufRead,
W: Write {
input! {
stdin = reader,
n: usize
}
static HASH: usize = 1000000007;
let mut memo: Vec<usize> = vec![0; n + 3];
memo[1] = 1;
memo[2] = 2;
memo[3] = 2;
for i in 4..n + 1 {
memo[i] = (memo[i - 3] + memo[i - 2]) % HASH;
}
write!(writer, "{}", memo[n]);
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn sample1() {
assert_judge!(process, "3", "2");
}
#[test]
fn sample2() {
assert_judge!(process, "4", "3");
}
#[test]
fn sample3() {
assert_judge!(process, "100", "831891005");
}
}
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