use std::collections::*; // 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, $t)).collect::>() }; ($next:expr, usize1) => (read_value!($next, usize) - 1); ($next:expr, $t:ty) => ($next().parse::<$t>().expect("Parse error")); } fn main() { input! { n: usize, m: usize, a: [[i64; m]; m], xy: [(usize1, usize1); n], } let mut acc = vec![vec![0; m + 1]; m + 1]; for i in 0..m { for j in 0..m { acc[i + 1][j + 1] = acc[i + 1][j] + acc[i][j + 1] - acc[i][j] + a[i][j]; } } for &(x, y) in &xy { let mut tot = 0; for i in 0..x + 1 { for j in x + 1..m { let mut hm = HashMap::new(); for k in 0..y + 1 { *hm.entry(acc[j][k] - acc[i][k]).or_insert(0) += 1; } for k in y + 1..m { tot += *hm.get(&(acc[j][k] - acc[i][k])).unwrap_or(&0); } } } println!("{}", tot); } }