結果

問題 No.1211 円環はお断り
ユーザー koba-e964koba-e964
提出日時 2020-08-30 14:44:44
言語 Rust
(1.77.0 + proconio)
結果
AC  
実行時間 1,399 ms / 2,000 ms
コード長 4,387 bytes
コンパイル時間 14,232 ms
コンパイル使用メモリ 390,908 KB
実行使用メモリ 30,976 KB
最終ジャッジ日時 2024-05-02 21:29:24
合計ジャッジ時間 31,905 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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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 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 1 ms
5,376 KB
testcase_11 AC 1 ms
5,376 KB
testcase_12 AC 1 ms
5,376 KB
testcase_13 AC 435 ms
16,904 KB
testcase_14 AC 745 ms
21,888 KB
testcase_15 AC 601 ms
21,376 KB
testcase_16 AC 906 ms
30,368 KB
testcase_17 AC 66 ms
5,376 KB
testcase_18 AC 542 ms
19,200 KB
testcase_19 AC 68 ms
5,376 KB
testcase_20 AC 92 ms
5,376 KB
testcase_21 AC 84 ms
5,376 KB
testcase_22 AC 453 ms
17,692 KB
testcase_23 AC 539 ms
20,224 KB
testcase_24 AC 294 ms
12,308 KB
testcase_25 AC 16 ms
5,376 KB
testcase_26 AC 643 ms
22,968 KB
testcase_27 AC 297 ms
12,524 KB
testcase_28 AC 651 ms
23,560 KB
testcase_29 AC 498 ms
19,072 KB
testcase_30 AC 665 ms
24,448 KB
testcase_31 AC 260 ms
11,144 KB
testcase_32 AC 794 ms
28,160 KB
testcase_33 AC 897 ms
30,776 KB
testcase_34 AC 894 ms
30,780 KB
testcase_35 AC 894 ms
30,784 KB
testcase_36 AC 903 ms
30,848 KB
testcase_37 AC 878 ms
30,940 KB
testcase_38 AC 892 ms
30,976 KB
testcase_39 AC 897 ms
30,848 KB
testcase_40 AC 1,399 ms
30,848 KB
testcase_41 AC 1 ms
5,376 KB
testcase_42 AC 1 ms
5,376 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 # 

#[allow(unused_imports)]
use std::cmp::*;
#[allow(unused_imports)]
use std::collections::*;
use std::io::{Write, BufWriter};
// https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
macro_rules! input {
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
        let mut next = move || -> String{
            bytes
                .by_ref()
                .map(|r|r.unwrap() as char)
                .skip_while(|c|c.is_whitespace())
                .take_while(|c|!c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}

macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr, ) => {};
    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}

macro_rules! read_value {
    ($next:expr, [graph1; $len:expr]) => {{
        let mut g = vec![vec![]; $len];
        let ab = read_value!($next, [(usize1, usize1)]);
        for (a, b) in ab {
            g[a].push(b);
            g[b].push(a);
        }
        g
    }};
    ($next:expr, ( $($t:tt),* )) => {
        ( $(read_value!($next, $t)),* )
    };
    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };
    ($next:expr, chars) => {
        read_value!($next, String).chars().collect::<Vec<char>>()
    };
    ($next:expr, usize1) => (read_value!($next, usize) - 1);
    ($next:expr, [ $t:tt ]) => {{
        let len = read_value!($next, usize);
        read_value!($next, [$t; len])
    }};
    ($next:expr, $t:ty) => ($next().parse::<$t>().expect("Parse error"));
}

#[allow(unused)]
macro_rules! debug {
    ($($format:tt)*) => (write!(std::io::stderr(), $($format)*).unwrap());
}
#[allow(unused)]
macro_rules! debugln {
    ($($format:tt)*) => (writeln!(std::io::stderr(), $($format)*).unwrap());
}

trait Bisect<T> {
    fn lower_bound(&self, val: &T) -> usize;
    fn upper_bound(&self, val: &T) -> usize;
}

impl<T: Ord> Bisect<T> for [T] {
    fn lower_bound(&self, val: &T) -> usize {
        let mut pass = self.len() + 1;
        let mut fail = 0;
        while pass - fail > 1 {
            let mid = (pass + fail) / 2;
            if &self[mid - 1] >= val {
                pass = mid;
            } else {
                fail = mid;
            }
        }
        pass - 1
    }
    fn upper_bound(&self, val: &T) -> usize {
        let mut pass = self.len() + 1;
        let mut fail = 0;
        while pass - fail > 1 {
            let mid = (pass + fail) / 2;
            if &self[mid - 1] > val {
                pass = mid;
            } else {
                fail = mid;
            }
        }
        pass - 1
    }
}

const B: usize = 17;

fn check(x: i64, a: &[i64], acc: &[i64], k: usize) -> bool {
    let n = a.len();
    let mut dp = vec![vec![0; 2 * n + 1]; B];
    for i in 0..n {
        let idx = acc.lower_bound(&(acc[i] + x));
        dp[0][i] = idx;
        dp[0][i + n] = min(idx + n, 2 * n);
    }
    dp[0][2 * n] = 2 * n;
    for i in 0..B - 1 {
        for j in 0..2 * n + 1 {
            dp[i + 1][j] = dp[i][dp[i][j]];
        }
    }
    for i in 0..n {
        let mut to = i;
        for j in 0..B {
            if (k & 1 << j) != 0 {
                to = dp[j][to];
            }
        }
        if to <= i + n {
            return true;
        }
    }
    false
}

fn solve() {
    let out = std::io::stdout();
    let mut out = BufWriter::new(out.lock());
    macro_rules! puts {
        ($($format:tt)*) => (let _ = write!(out,$($format)*););
    }
    input! {
        n: usize, k: usize,
        a: [i64; n],
    }
    let sum: i64 = a.iter().sum();
    let mut pass = 0;
    let mut fail = sum / k as i64 + 1;
    let mut acc = vec![0; 2 * n + 1];
    for i in 0..2 * n {
        acc[i + 1] = acc[i] + a[i % n];
    }
    while fail - pass > 1 {
        let mid = (fail + pass) / 2;
        if check(mid, &a, &acc, k) {
            pass = mid;
        } else {
            fail = mid;
        }
    }
    puts!("{}\n", pass);
}

fn main() {
    // In order to avoid potential stack overflow, spawn a new thread.
    let stack_size = 104_857_600; // 100 MB
    let thd = std::thread::Builder::new().stack_size(stack_size);
    thd.spawn(|| solve()).unwrap().join().unwrap();
}
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