#398015 (Rust) No.921 ずんだアロー

• 問題: No.921 ずんだアロー
• ユーザー: manta1130
• 提出日時: 2019-11-13 23:15:58
• 言語: Rust (1.77.0 + proconio)
• 結果: AC
• 実行時間: 6 ms / 2,000 ms
• コード長: 3,480 bytes
• コンパイル時間: 14,256 ms
• コンパイル使用メモリ: 379,920 KB
• 実行使用メモリ: 5,376 KB
• 最終ジャッジ日時: 2024-09-21 21:18:34
• 合計ジャッジ時間: 13,588 ms
• ジャッジサーバーID （参考情報）: judge2 / judge4

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	1 ms; 5,248 KB
testcase_01	AC	1 ms; 5,376 KB
testcase_02	AC	1 ms; 5,376 KB
testcase_03	AC	1 ms; 5,376 KB
testcase_04	AC	1 ms; 5,376 KB
testcase_05	AC	1 ms; 5,376 KB
testcase_06	AC	1 ms; 5,376 KB
testcase_07	AC	1 ms; 5,376 KB
testcase_08	AC	1 ms; 5,376 KB
testcase_09	AC	1 ms; 5,376 KB
testcase_10	AC	6 ms; 5,376 KB
testcase_11	AC	6 ms; 5,376 KB
testcase_12	AC	2 ms; 5,376 KB
testcase_13	AC	4 ms; 5,376 KB
testcase_14	AC	5 ms; 5,376 KB
testcase_15	AC	4 ms; 5,376 KB
testcase_16	AC	2 ms; 5,376 KB
testcase_17	AC	5 ms; 5,376 KB
testcase_18	AC	5 ms; 5,376 KB
testcase_19	AC	5 ms; 5,376 KB
testcase_20	AC	5 ms; 5,376 KB
testcase_21	AC	5 ms; 5,376 KB
testcase_22	AC	5 ms; 5,376 KB
testcase_23	AC	5 ms; 5,376 KB
testcase_24	AC	5 ms; 5,376 KB

コンパイルメッセージ

warning: variable `n` is assigned to, but never used
   --> src/main.rs:112:9
    |
112 |     let n: usize;
    |         ^
    |
    = note: consider using `_n` instead
    = note: `#[warn(unused_variables)]` on by default

warning: value assigned to `n` is never read
   --> src/main.rs:113:12
    |
113 |     input!(n);
    |            ^
    |
    = help: maybe it is overwritten before being read?
    = note: `#[warn(unused_assignments)]` on by default

ソースコード

//  ____            _                  _                       _       _
// |  _ \ _   _ ___| |_    ___ _ __   | |_ ___ _ __ ___  _ __ | | __ _| |_ ___
// | |_) | | | / __| __|  / __| '_ \  | __/ _ \ '_ ` _ \| '_ \| |/ _` | __/ _ \
// |  _ <| |_| \__ \ |_  | (__| |_) | | ||  __/ | | | | | |_) | | (_| | ||  __/
// |_| \_\\__,_|___/\__|  \___| .__/___\__\___|_| |_| |_| .__/|_|\__,_|\__\___|
//                            |_| |_____|               |_|

//https://github.com/manta1130/Competitive_Programming_Template_Rust

#[macro_use]
mod input {

    use std;
    use std::io;

    const SPLIT_DELIMITER: char = ' ';

    #[macro_export]
    #[allow(unused_macros)]
    macro_rules! input {
    ( $($x:expr ),*) => {
        {
            let temp_str = input_line_str();
            let mut split_result_iter = temp_str.split_whitespace();
                $(
                let buf_split_result = split_result_iter.next();
                let buf_split_result = buf_split_result.unwrap();
                    ($x) = buf_split_result.parse().unwrap();
                )*
        }
    };
}

    #[allow(dead_code)]
    pub fn input_line_str() -> String {
        let mut s = String::new();
        io::stdin().read_line(&mut s).unwrap();
        s.trim().to_string()
    }

    #[allow(dead_code)]
    pub fn p<T>(t: T)
    where
        T: std::fmt::Display,
    {
        println!("{}", t);
    }

    #[allow(dead_code)]
    pub fn input_vector2d<T>(line: usize) -> Vec<Vec<T>>
    where
        T: std::str::FromStr,
    {
        let mut v: Vec<Vec<T>> = Vec::new();

        for _ in 0..line {
            let vec_line = input_vector();
            v.push(vec_line);
        }
        v
    }

    #[allow(dead_code)]
    pub fn input_vector<T>() -> Vec<T>
    where
        T: std::str::FromStr,
    {
        let mut v: Vec<T> = Vec::new();

        let s = input_line_str();
        let split_result = s.split(SPLIT_DELIMITER);
        for z in split_result {
            let buf = match z.parse() {
                Ok(r) => r,
                Err(_) => panic!("Parse Error"),
            };
            v.push(buf);
        }
        v
    }

    #[allow(dead_code)]
    pub fn input_vector_row<T>(n: usize) -> Vec<T>
    where
        T: std::str::FromStr,
    {
        let mut v = Vec::with_capacity(n);
        for _ in 0..n {
            let buf = match input_line_str().parse() {
                Ok(r) => r,
                Err(_) => panic!("Parse Error"),
            };
            v.push(buf);
        }
        v
    }

    pub trait ToCharVec {
        fn to_charvec(&self) -> Vec<char>;
    }

    impl ToCharVec for String {
        fn to_charvec(&self) -> Vec<char> {
            self.to_string().chars().collect::<Vec<_>>()
        }
    }
}

use input::*;

fn main() {
    let n: usize;
    input!(n);
    let v = input_vector::<usize>();
    let mut count = 0;
    let mut prev = v[0];
    let mut table = vec![];

    for a in &v {
        if prev == *a {
            count += 1;
        } else {
            prev = *a;
            table.push(count);
            count = 1;
        }
    }
    if count != 0 {
        table.push(count);
    }

    let mut dp = vec![0; table.len() + 1];
    dp[0] = 0;
    dp[1] = table[0];
    for i in 2..table.len() + 1 {
        dp[i] = std::cmp::max(dp[i - 2] + table[i - 1], dp[i - 1] + table[i - 1] - 1);
    }

    //println!("{:?}",&table);
    //println!("{:?}",&dp);

    p(dp.iter().last().unwrap());
}