Submission #4014722

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Source Code Expand

#[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, ( $($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);
        (0..len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    }};

    ($next:expr, $t:ty) => {
        $next().parse::<$t>().expect("Parse error")
    };
}

fn solve() {
    let out = std::io::stdout();
    let mut out = BufWriter::new(out.lock());
    macro_rules! puts {
        ($($format:tt)*) => (write!(out,$($format)*).unwrap());
    }
    input! {
        n: usize,
        d: i64,
        a: [i64; n],
    }
    let mut g = vec![Vec::new(); 2 * n];
    for i in 0 .. n {
        g[i].push((n + i, a[i]));
        g[n + i].push((i, a[i]));
    }
    for i in 0 .. n - 1 {
        g[n + i].push((n + i + 1, d));
        g[n + i + 1].push((n + i, d));
    }
    let mut que = BinaryHeap::new();
    const INF: i64 = 1 << 50;
    let mut dp = vec![(INF, 2 * n); 2 * n];
    for i in 0 .. n {
        que.push((0, i, i));
    }
    let mut tot = 0;
    while let Some((dist, v, w)) = que.pop() {
        let dist = -dist;
        if dp[w].0 == INF {
            dp[w] = (dist, v);
            for &(u, cost) in g[w].iter() { 
                que.push((-dist - cost, v, u));
            }
        } else {
            // dp[w].1 and v meets
            if v != dp[w].1 {
                tot += dp[w].0 + dist;
            }
        }
    }
    puts!("{}\n", tot / 2);
}

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();
}

Submission Info

Judge Result