How do you check if one array is a subsequence of another?

Question

I\'m looking to explore different algorithms, both recursive and dynamic programming, that checks if one arrayA is a subsequence of arrayB. For example,

arra         


        

Answer 1

Here is an example in Ruby:

def sub_seq?(a_, b_)
  arr_a = [a_,b_].max_by(&:length);
  arr_b = [a_,b_].min_by(&:length);
  arr_a.select.with_index do |a, index|
    arr_a.index(a) &&
    arr_b.index(a) &&
    arr_b.index(a) <= arr_a.index(a)
  end == arr_b
end

arrayA = [1, 2, 3] 
arrayB = [5, 6, 1, 7, 2, 9, 3]

puts sub_seq?(arrayA, arrayB).inspect #=> true