//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, $t)).collect::>() }; ($iter:expr, chars) => { read_value!($iter, String).chars().collect::>() }; ($iter:expr, usize1) => { read_value!($iter, usize) - 1 }; ($iter:expr, $t:ty) => { $iter.next().unwrap().parse::<$t>().expect("Parse error") }; } // fn run() { input! { h: usize, w: usize, s: (usize1, usize1), t: (usize1, usize1), board: [chars; h], } let mut dp = vec![vec![std::usize::MAX; w]; h]; let mut q = std::collections::VecDeque::new(); dp[s.0][s.1] = 0; q.push_back(s); while let Some((x, y)) = q.pop_front() { for &(mut a, mut b) in [(x - 1, y), (x + 1, y), (x, y - 1), (x, y + 1)].iter() { if x == h - 1 && a > h - 1 { a = 0; } if y == w - 1 && b > w - 1 { b = 0; } if a > h { a = h - 1; } if b > w { b = w - 1; } if a < h && b < w && board[a][b] == '.' && dp[a][b] > dp[x][y] + 1 { dp[a][b] = dp[x][y] + 1; q.push_back((a, b)); } } } println!("{}", dp[t.0][t.1]); } fn main() { run(); }