task1.rb

# Takes an array of integers as an argument
# and returns the sum of its elements.
# For an empty array it should return zero.
def sum(array)
  array.inject(0) { |r, e| r + e }
end

# Takes an array of integers as an argument
# and returns the sum of its two largest elements.
# For an empty array it should return zero.
# For an array with just one element,
# it should return that element.
def max_2_sum(array)
  new = []
  while new.size < 2 && array.size != 0
    array.sort!
    new << array.max
    array.pop
  end
  sum new
end

# DIFFICULT
# Takes an array of integers
# and an additional integer, n, as arguments
# and returns true
# if any two elements in the array of integers sum to n.
# An empty array should sum to zero by definition.
def sum_to_n?(array, n)
  raise "Not yet implemented"
end