I need to locate all integer elements in an array, whose sum is equal to one of the integer elements within the array. For example, let's assume I have an array like this as input: [1, 2, 4, 10, 90, 302, 312, 500] Then output should have all integer elements including the integer element which is sum of other elements. It will be like: [10, 302,…

find_sum_of_array.rb

arr = [1, 2, 4, 10, 90, 302, 312, 500]

(2..arr.count).each do |len|
  arr.combination(len).each do |comb|
    sum = comb.inject(:+)
    if arr.include? sum
      puts (comb << sum).inspect
    end
  end
end