Codility-Lesson 1-Challenge 1

codility1-1.rb

def solution(a)
  if a.empty?
    0
  elsif a.length==2
    a[1]-a[0]
  else
    right=a.inject(:+)-a[0]
    left=a[0]
    min=(right-left).abs
    (1..a.length-1).each do |i|
      right-=a[i]
      left+=a[i]
      if (left-right).abs<min
        min=(left-right).abs
      end
    end
    min
  end
end