Function acc2D

pub fn acc2D<T: Num + Copy>(
    array: &Vec<Vec<T>>,
) -> impl Fn(usize, usize, usize, usize) -> T

acc2D

• 2次元累積和を取る

戻り値

• |r_start, r_end, c_start, c_end|: (usize, usize, usize, usize) -> T