Riddle by Einstein
11月 2nd, 2009
未分类
Let us assume that there are five houses of different colors next to each other on the same road. In each house lives a man of a different nationality. Every man has his favorite drink, his favorite brand of cigarettes, and keeps pets of a particular kind.
1. The Englishman lives in the red house.
2. The Swede keeps dogs.
3. The Dane drinks tea.
4. The green house is just to the left of the white one.
5. The owner of the green house drinks coffee.
6. The Pall Mall smoker keeps birds.
7. The owner of the yellow house smokes Dunhills.
8. The man in the center house drinks milk.
9. The Norwegian lives in the first house.
10. The Blend smoker has a neighbor who keeps cats.
11. The man who smokes Blue Masters drinks bier.
12. The man who keeps horses lives next to the Dunhill smoker.
13. The German smokes Prince.
14. The Norwegian lives next to the blue house.
15. The Blend smoker has a neighbor who drinks water.
The question to be answered is: Who keeps fish?
Einstein wrote this riddle early during the 19th century. He said 98% of the world could not solve it. Its not hard, you just need to pay attention and be patient.
class Person attr_accessor :nationality, :residing, :drinking, :smoking, :pet, :number def initialize(number, residing = nil) @number = number @residing = residing end end class Residing attr_accessor :number, :host, :color def initialize(number, color = nil, host = nil) @number = number @host = host @color = color end end residing_1 = Residing.new(1, "yellow") # making use of condition 9, 7 person_1 = Person.new(1, residing_1) person_1.nationality = "Norway" #making use of condition 9 person_1.smoking = "DUNHILL" #making use of condition 7 person_1.pet = "cat" #"cat" residing_2 = Residing.new(2, "blue") # making use of condition 14 person_2 = Person.new(2, residing_2) person_2.pet = "horse" # condition 11 person_2.nationality = "Denmark" person_2.drinking = "tea" person_2.smoking = "blend cigarette" #"Denmark" "tea" "blend" residing_3 = Residing.new(3, nil) #making use of condition 8 person_3 = Person.new(3, residing_3) person_3.nationality = "English" person_3.drinking = "milk" #making use of condition 8 person_3.residing.color = "red" #making use of conditon 1 person_3.smoking = "PALL MALL" person_3.pet = "bird" #"PALL MALL" "bird" residing_4 = Residing.new(4, "green")# making use person_4 = Person.new(4, residing_4) person_4.drinking = "coffee" # making use of condition 5 person_4.nationality = "German" person_4.smoking = "PRINCE" #"Germ" "PRINCE" residing_5 = Residing.new(5, "white")# making use of condition 9,14,4 person_5 = Person.new(5, residing_5) person_5.nationality = "Sweden" person_5.pet = "dog" person_5.smoking = "BLUE MASTER" person_5.drinking = "beer" #"Sweden" "dog" #"BLUE MASTER" "beer" #after the initialization of the status,input as the followings arr = [person_1, person_2, person_3, person_4, person_5] arr.each do |i| i.pet ||= "fish" puts "Nationality: #{i.nationality}; house-color: #{i.residing.color}, drink #{i.drinking}, smoke #{i.smoking}, raise the pet #{i.pet} " end
