equilibrium.rb

class Solution
    def solution(array)
        left_part = array[0]
        right_part = array.sum - left_part
        diff = (left_part - right_part).abs
        total = array.length
        
        array.each_with_index do |element, index|
            next if index == 0
            
            left_part += element
            right_part -= element
            new_diff = (left_part - right_part).abs
            diff = [diff, new_diff].min
        end
        
        diff
    end
end

puts Solution.new.solution([3,1,2,4,3])