#!/usr/bin/ruby

N = 5
R = 5
C = 10

T = [[5, 5, 5, 5],
     [0, 5, 5, 5],
     [0, 0, 5, 5],
     [0, 0, 0, 5]]

#the bay is organized by columns, since that's more likely
#what we will be working with.
bay = Array.new(C, Array.new(R, nil))

# Unloads all the containers for the current port
# returns the number of unnecessary moves
def unload!(bay, location)
  moves = 0
  bay.each { |col|
    if col.include? location
      col.reverse_each { |x|
        if x == location
          x = nil
        else 
          if x
            moves += 1
          end
        end
      }
      compact!(bay, col)
    end
  }
  return moves
end

# shifts all the nil entries to the top
# appropriately.
def compact!(bay, col)
  
end

bay[0][0] = 1
bay[0][1] = 2
bay[0][2] = 1

p bay

unload!(bay, 1)
p bay