Submission #7142843

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Source Code Expand

//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, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

// ここまで

use std::collections::HashMap;
use std::cmp::max;

fn calc(a: u32, b: u32, c: u32, d: u32, p: &Vec<(u32, u32)>, mut memo: &mut HashMap<(u32, u32, u32, u32), u32>) -> u32 {
    if a > b || c > d {
        return 0;
    }
    if let Some(&v) = memo.get(&(a, b, c, d)) {
        return v;
    }
    let mut ans = 0;
    for &(x, y) in p.iter() {
        if a <= x && x <= b && c <= y && y <= d {
            let mut v = (b - a) + (d - c) + 1;
            v += calc(a    , x - 1, c    , y - 1, &p, &mut memo);
            v += calc(a    , x - 1, y + 1, d    , &p, &mut memo);
            v += calc(x + 1, b    , c    , y - 1, &p, &mut memo);
            v += calc(x + 1, b    , y + 1, d    , &p, &mut memo);
            ans = max(ans, v);
        }
    }
    memo.insert((a, b, c, d), ans);
    ans
}

fn run() {
    input! {
        w: u32,
        h: u32,
        n: usize,
        p: [(u32, u32); n],
    }
    let mut memo = HashMap::new();
    let ans = calc(1, w, 1, h, &p, &mut memo);
    println!("{}", ans);
}

fn main() {
    run();
}

Submission Info

Judge Result