#845683 (Rust) No.2234 palindromer

• 問題: No.2234 palindromer
• ユーザー: akakimidori
• 提出日時: 2023-03-03 22:05:42
• 言語: Rust (1.83.0 + proconio)
• 結果: AC
• 実行時間: 1 ms / 2,000 ms
• コード長: 2,558 bytes
• コンパイル時間: 12,419 ms
• コンパイル使用メモリ: 401,668 KB
• 実行使用メモリ: 6,944 KB
• 最終ジャッジ日時: 2024-09-17 23:06:06
• 合計ジャッジ時間: 12,837 ms
• ジャッジサーバーID （参考情報）: judge5 / judge6

ファイルパターン	結果
sample	AC * 3
other	AC * 13

ソースコード

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fn main() {
    input!(a: bytes);
    let mut ans = a.iter().chain(a.iter().rev()).cloned().collect::<Vec<_>>();
    for i in 0..a.len() {
        let b = &a[..=i];
        let mut c = b.iter().chain(b.iter().rev()).cloned().collect::<Vec<_>>();
        if c.starts_with(&a) && c.len() < ans.len() {
            ans = c.clone();
        }
        c.remove(i);
        if c.starts_with(&a) && c.len() < ans.len() {
            ans = c.clone();
        }
        c.remove(i);
    }
    use util::*;
    println!("{}", ans.iter().map(|c| *c as char).join(""));
}
// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[macro_export]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}
#[macro_export]
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_export]
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, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------
mod util {
    pub trait Join {
        fn join(self, sep: &str) -> String;
    }
    impl<T, I> Join for I
    where
        I: Iterator<Item = T>,
        T: std::fmt::Display,
    {
        fn join(self, sep: &str) -> String {
            let mut s = String::new();
            use std::fmt::*;
            for (i, v) in self.enumerate() {
                if i > 0 {
                    write!(&mut s, "{}", sep).ok();
                }
                write!(&mut s, "{}", v).ok();
            }
            s
        }
    }
}
 
 
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