judge.rb aiming for a tie, doesn't work yet

judge.rb

def pick_tie_jurors(potential_jurors, k)
  potential_jurors.combination(k).map do |combo| # 2 3
    p_tie = combo.combination(combo.count / 2).map { |possibles| # [2] # [3]
      # inverses = [2, 3] - [2] # bug with distinct # [3]
      inverses = (combo - possibles).map { |i| 1 - i } # bug with distinct # [3]

      acc = 0
      possibles.map { |pos|
        inverses.map { |inv|
          pos * inv
        }.sum
      }.sum
    }.max # show which vote directions?
    # return a

    # p_tie = combo.first * (1 - combo.last) + combo.last * (1 - combo.first)
    [p_tie, combo]
  end.max_by { |chance, _combo| chance }
end


p pick_tie_jurors([0.2, 0.5, 0.8], 2) # [0.2, 0.8]


p pick_tie_jurors([0.1, 0.2, 0.3, 0.7, 0.8, 0.9], 4)