mvw

1: 111
2: 112
3: 121
4: 123
5: 132
6: 211
7: 213
8: 231
9: 312
10: 321

mvw

def dp(a, b, c)
  a*b*c
end

def ds(a, b, c)
  a+b+c
end

count = 0
(1..9).each do |a|

mvw

def run
  urn = [:blue, :blue, :red, :red, :red]
  blue = 0
  n = urn.size
  (1..n).each do |k|
    index = rand(urn.size)
    ball = urn.delete_at(index)
    #puts "ball=#{ball} urn=#{urn}"
    if ball == :blue
      blue += 1

mvw

# planet.rb
#
# Planet Ship Intersection
#
# http://math.stackexchange.com/q/2071775/86776

require "matrix.rb"

# problem instance
$x0 = 1.0

mvw

 24 36 79
 30 36 90
 36 36 101
 42 36 113
 48 36 127
 54 36 134
 60 36 146
 66 36 158
 72 36 169
 78 36 181

mvw

a0 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17]
1. [1, 10, 16]
2. [2, 8, 10]
3. [3, 9, 17]
4. [3, 13, 15]
5. [1, 8, 13]
6. [10, 12, 15]
7. [4, 10, 15]
8. [2, 8, 15]
9. [1, 3, 10]

mvw

# http://math.stackexchange.com/q/2012173/86776

def sim(n, runs)
  a0 = Array.new
  (1..n).each do |k|
    a0 << k
  end
  puts "a0 = #{a0}"
  h = Hash.new
  found = 0

mvw

# cubes56.rb
# http://math.stackexchange.com/q/2010848/86776
i = 0
(100..999).each do |n|
  q = n**3
  next if q % 100 != 56
  i += 1
  puts "#{i}: (#{n})**3 = #{q}"
end

mvw

# http://math.stackexchange.com/q/2000829/86776

require 'set'

class Jar
  @cookies

  def initialize
    @cookies = Set.new
    (1..10).each do |k|

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# inverse
#
# http://math.stackexchange.com/q/1940277/86776

load "set.rb"

SX = 25
SY = 25

def empty_graph()