結果

問題 No.2921 Seated in Classroom
ユーザー ぱるまぱるま
提出日時 2024-10-12 15:02:45
言語 Rust
(1.77.0 + proconio)
結果
AC  
実行時間 259 ms / 2,000 ms
コード長 5,462 bytes
コンパイル時間 12,839 ms
コンパイル使用メモリ 379,072 KB
実行使用メモリ 5,376 KB
最終ジャッジ日時 2024-10-12 15:03:03
合計ジャッジ時間 15,223 ms
ジャッジサーバーID
(参考情報)
judge4 / judge2
このコードへのチャレンジ
(要ログイン)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 220 ms
5,248 KB
testcase_01 AC 134 ms
5,248 KB
testcase_02 AC 97 ms
5,248 KB
testcase_03 AC 242 ms
5,376 KB
testcase_04 AC 259 ms
5,248 KB
testcase_05 AC 1 ms
5,248 KB
testcase_06 AC 1 ms
5,248 KB
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 #

//#[derive_readable]
#[derive(Debug, Clone)]
struct Problem {
    n: usize,
    m: usize,
}

impl Problem {
    fn read() -> Problem {
        input! {
            n: usize,
            m: usize,
        }
        Problem { n, m }
    }

    fn solve(&self) -> Answer {
        let n_need = self.n; // 充電が必要
        let n_non_need = self.m; // 充電が不要
                                 // まずは充電が必要な人を座らせる
        let n_row_need = if n_need % 4 == 0 {
            n_need / 4
        } else {
            n_need / 4 + 1
        };
        let n_charge_remain = if n_need % 4 == 0 { 0 } else { 4 - n_need % 4 };
        // n_charge_remainの数だけ充電が不要な人も座らせる
        if n_non_need <= n_charge_remain {
            return Answer { ans: n_row_need };
        }
        let n_non_need2 = n_non_need - n_charge_remain;

        if n_non_need2 <= 4 * n_row_need {
            return Answer { ans: n_row_need };
        }

        let n_non_need3 = n_non_need2 - 4 * n_row_need;

        let n_row_non_need = if n_non_need3 % 8 == 0 {
            n_non_need3 / 8
        } else {
            n_non_need3 / 8 + 1
        };

        Answer {
            ans: n_row_need + n_row_non_need,
        }
    }

    #[allow(dead_code)]
    fn solve_naive(&self) -> Answer {
        todo!();
        // let ans = 0;
        // Answer { ans }
    }
}

#[derive(Clone, Debug, PartialEq, Eq)]
struct Answer {
    ans: usize,
}

impl Answer {
    fn print(&self) {
        println!("{}", self.ans);
    }
}

fn main() {
    input! {
        t: usize
    }
    for _ in 0..t {
        Problem::read().solve().print();
    }
}

#[cfg(test)]
mod tests {
    #[allow(unused_imports)]
    use super::*;
    #[allow(unused_imports)]
    use rand::{rngs::SmallRng, seq::SliceRandom, *};

    #[test]
    fn test_problem() {
        assert_eq!(1 + 1, 2);
    }

    #[allow(dead_code)]
    #[derive(Debug)]
    struct WrongTestCase {
        problem: Problem,
        main_ans: Answer,
        naive_ans: Answer,
    }

    #[allow(dead_code)]
    fn check(p: &Problem) -> Option<WrongTestCase> {
        let main_ans = p.solve();
        let naive_ans = p.solve_naive();
        if main_ans != naive_ans {
            Some(WrongTestCase {
                problem: p.clone(),
                main_ans,
                naive_ans,
            })
        } else {
            None
        }
    }

    #[allow(dead_code)]
    fn make_random_problem(rng: &mut SmallRng) -> Problem {
        todo!()
        // let n = rng.gen_range(1..=10);
        // let p = Problem { _a: n };
        // println!("{:?}", &p);
        // p
    }

    #[allow(unreachable_code)]
    #[test]
    fn test_with_naive() {
        let num_tests = 0;
        let max_wrong_case = 10; // この件数間違いが見つかったら打ち切り
        let mut rng = SmallRng::seed_from_u64(42);
        // let mut rng = SmallRng::from_entropy();
        let mut wrong_cases: Vec<WrongTestCase> = vec![];
        for _ in 0..num_tests {
            let p = make_random_problem(&mut rng);
            let result = check(&p);
            if let Some(wrong_test_case) = result {
                wrong_cases.push(wrong_test_case);
            }
            if wrong_cases.len() >= max_wrong_case {
                break;
            }
        }

        if !wrong_cases.is_empty() {
            for t in &wrong_cases {
                println!("{:?}", t.problem);
                println!("main ans : {:?}", t.main_ans);
                println!("naive ans: {:?}", t.naive_ans);
                println!();
            }
            println!("{} cases are wrong.", wrong_cases.len());
            panic!();
        }
    }
}

// ====== import ======
#[allow(unused_imports)]
use proconio::{
    derive_readable, fastout, input,
    marker::{Bytes, Chars, Usize1},
};
#[allow(unused_imports)]
use std::cmp::Reverse;
#[allow(unused_imports)]
use std::collections::{BinaryHeap, HashMap, HashSet};

// ====== output func ======
#[allow(unused_imports)]
use print_vec::*;
pub mod print_vec {

    use proconio::fastout;
    #[fastout]
    pub fn print_vec<T: std::fmt::Debug>(arr: &[T]) {
        for a in arr {
            println!("{:?}", a);
        }
    }
    #[fastout]
    pub fn print_vec_1line<T: std::fmt::Debug>(arr: &[T]) {
        let msg = arr
            .iter()
            .map(|x| format!("{:?}", x))
            .collect::<Vec<String>>()
            .join(" ");
        println!("{}", msg);
    }
    #[fastout]
    pub fn print_vec2<T: std::fmt::Debug>(arr: &Vec<Vec<T>>) {
        for row in arr {
            let msg = row
                .iter()
                .map(|x| format!("{:?}", x))
                .collect::<Vec<String>>()
                .join(" ");
            println!("{}", msg);
        }
    }
    pub fn print_bytes(bytes: &[u8]) {
        let msg = String::from_utf8(bytes.to_vec()).unwrap();
        println!("{}", msg);
    }
    pub fn print_chars(chars: &[char]) {
        let msg = chars.iter().collect::<String>();
        println!("{}", msg);
    }
    #[fastout]
    pub fn print_vec_bytes(vec_bytes: &[Vec<u8>]) {
        for row in vec_bytes {
            let msg = String::from_utf8(row.to_vec()).unwrap();
            println!("{}", msg);
        }
    }
}

#[allow(unused)]
fn print_yesno(ans: bool) {
    let msg = if ans { "Yes" } else { "No" };
    println!("{}", msg);
}

// ====== snippet ======
0