結果

問題 No.1117 数列分割
ユーザー akakimidori
提出日時 2020-07-18 00:17:25
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 591 ms / 3,000 ms
コード長 5,006 bytes
コンパイル時間 12,698 ms
コンパイル使用メモリ 405,532 KB
実行使用メモリ 6,820 KB
最終ジャッジ日時 2024-11-30 05:49:58
合計ジャッジ時間 17,607 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 26
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 #
プレゼンテーションモードにする

// ---------- begin Foldable Deque ----------
struct FoldableDeque<T, F> {
    front: Vec<(T, T)>,
    back: Vec<(T, T)>,
    op: F,
}
#[allow(dead_code)]
impl<T, F> FoldableDeque<T, F>
where
    T: Clone,
    F: Fn(&T, &T) -> T,
{
    fn new(op: F) -> Self {
        FoldableDeque {
            front: Vec::new(),
            back: Vec::new(),
            op: op,
        }
    }
    fn find(&self) -> Option<T> {
        match (self.front.last(), self.back.last()) {
            (Some(a), Some(b)) => Some((self.op)(&a.1, &b.1)),
            (Some(a), None) => Some(a.1.clone()),
            (None, Some(b)) => Some(b.1.clone()),
            (None, None) => None,
        }
    }
    fn clear(&mut self) {
        self.front.clear();
        self.back.clear();
    }
    fn len(&self) -> usize {
        self.front.len() + self.back.len()
    }
    fn push_back(&mut self, val: T) {
        let sum = self
            .back
            .last()
            .map_or_else(|| val.clone(), |p| (self.op)(&p.1, &val));
        self.back.push((val, sum));
    }
    fn push_front(&mut self, val: T) {
        let sum = self
            .front
            .last()
            .map_or_else(|| val.clone(), |p| (self.op)(&val, &p.1));
        self.front.push((val, sum));
    }
    fn pop_front(&mut self) -> Option<T> {
        if self.len() == 0 {
            return None;
        }
        if self.front.is_empty() {
            let a = self.back.clone();
            let m = (self.back.len() + 1) / 2;
            self.back.clear();
            let (f, b) = a.split_at(m);
            for v in f.iter().rev() {
                self.push_front(v.0.clone());
            }
            for v in b.iter() {
                self.push_back(v.0.clone());
            }
        }
        self.front.pop().map(|p| p.0)
    }
    fn pop_back(&mut self) -> Option<T> {
        if self.len() == 0 {
            return None;
        }
        if self.back.is_empty() {
            let a = self.front.clone();
            let m = self.front.len() / 2;
            self.front.clear();
            let (f, b) = a.split_at(m);
            for v in b.iter() {
                self.push_front(v.0.clone());
            }
            for v in f.iter().rev() {
                self.push_back(v.0.clone());
            }
        }
        self.back.pop().map(|p| p.0)
    }
}
// ---------- end Foldable Deque ----------
//https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8 より
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_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, 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")
    };
}
//
fn run() {
    input! {
        n: usize,
        k: usize,
        m: usize,
        a: [f64; n],
    }
    let mut sum = a.clone();
    sum.push(0f64);
    for i in (0..n).rev() {
        sum[i] += sum[i + 1];
    }
    type T = (f64, f64);// f = |x - a| + b
    let eval = |f: &T, x: f64| -> f64 {
        (x - f.0).abs() + f.1
    };
    let merge = |a: &T, b: &T| -> T {
        let mut a = *a;
        let mut b = *b;
        if a.0 > b.0 {
            std::mem::swap(&mut a, &mut b);
        }
        if eval(&a, a.0) > eval(&b, a.0) {
            return a;
        }
        if eval(&a, b.0) < eval(&b, b.0) {
            return b;
        }
        let x = (a.0 + b.0 + b.1 - a.1) / 2f64;
        (x, eval(&a, x))
    };
    let mut deq = FoldableDeque::new(merge);
    let inf = 1e14;
    let mut dp = vec![-inf; n + 1];
    dp[n] = 0f64;
    for _it in 0..k {
        deq.clear();
        deq.push_front((sum[n], dp[n]));
        for i in (0..n).rev() {
            let v = eval(&deq.find().unwrap(), sum[i]).round();
            deq.push_front((sum[i], dp[i]));
            dp[i] = v;
            if deq.len() > m {
                deq.pop_back();
            }
        }
    }
    let ans = dp[0].round() as i64;
    println!("{}", ans);
}
fn main() {
    run();
}
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