Function alcs::compute_mat_ih_iv

pub fn compute_mat_ih_iv<T>(
    a: &[T], 
    b: &[T]
) -> (Vec<Vec<usize>>, Vec<Vec<usize>>) where
    T: Eq, 

Constructs the full matrices i_h and i_v

It requires O(|a|*|b|) space and O(|a|*|b|) time

let a = "word";
   let b = "hello world";
   let va = a.chars().collect::<Vec<char>>();
   let vb = b.chars().collect::<Vec<char>>();
   let (ih,iv) = alcs::compute_mat_ih_iv(&va,&vb);
   println!("{:?}\n{:?}",ih,iv);