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202 lines
8.3 KiB
Python
202 lines
8.3 KiB
Python
#!/usr/bin/python
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#
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# ALBERT EINSTEIN'S RIDDLE
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#
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# ARE YOU IN THE TOP 2% OF INTELLIGENT PEOPLE IN THE WORLD?
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# SOLVE THE RIDDLE AND FIND OUT.
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#
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# There are no tricks, just pure logic, so good luck and don't give up.
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#
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# 1. In a street there are five houses, painted five different colours.
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# 2. In each house lives a person of different nationality
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# 3. These five homeowners each drink a different kind of beverage, smoke
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# different brand of cigar and keep a different pet.
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#
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# THE QUESTION: WHO OWNS THE FISH?
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#
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# HINTS
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#
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# 1. The Brit lives in a red house.
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# 2. The Swede keeps dogs as pets.
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# 3. The Dane drinks tea.
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# 4. The Green house is on the left of the White house.
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# 5. The owner of the Green house drinks coffee.
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# 6. The person who smokes Pall Mall rears birds.
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# 7. The owner of the Yellow house smokes Dunhill.
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# 8. The man living in the centre house drinks milk.
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# 9. The Norwegian lives in the first house.
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# 10. The man who smokes Blends lives next to the one who keeps cats.
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# 11. The man who keeps horses lives next to the man who smokes Dunhill.
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# 12. The man who smokes Blue Master drinks beer.
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# 13. The German smokes Prince.
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# 14. The Norwegian lives next to the blue house.
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# 15. The man who smokes Blends has a neighbour who drinks water.
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#
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# ALBERT EINSTEIN WROTE THIS RIDDLE EARLY DURING THE 19th CENTURY. HE
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# SAID THAT 98% OF THE WORLD POPULATION WOULD NOT BE ABLE TO SOLVE IT.
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from constraint import *
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# Check http://www.csc.fi/oppaat/f95/python/talot.py
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def main():
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problem = Problem()
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for i in range(1,6):
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problem.addVariable("color%d" % i,
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["red", "white", "green", "yellow", "blue"])
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problem.addVariable("nationality%d" % i,
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["brit", "swede", "dane", "norwegian", "german"])
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problem.addVariable("drink%d" % i,
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["tea", "coffee", "milk", "beer", "water"])
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problem.addVariable("smoke%d" % i,
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["pallmall", "dunhill", "blends",
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"bluemaster", "prince"])
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problem.addVariable("pet%d" % i,
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["dogs", "birds", "cats", "horses", "fish"])
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problem.addConstraint(AllDifferentConstraint(),
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["color%d" % i for i in range(1,6)])
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problem.addConstraint(AllDifferentConstraint(),
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["nationality%d" % i for i in range(1,6)])
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problem.addConstraint(AllDifferentConstraint(),
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["drink%d" % i for i in range(1,6)])
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problem.addConstraint(AllDifferentConstraint(),
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["smoke%d" % i for i in range(1,6)])
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problem.addConstraint(AllDifferentConstraint(),
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["pet%d" % i for i in range(1,6)])
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for i in range(1,6):
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# Hint 1
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problem.addConstraint(lambda nationality, color:
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nationality != "brit" or color == "red",
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("nationality%d" % i, "color%d" % i))
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# Hint 2
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problem.addConstraint(lambda nationality, pet:
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nationality != "swede" or pet == "dogs",
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("nationality%d" % i, "pet%d" % i))
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# Hint 3
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problem.addConstraint(lambda nationality, drink:
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nationality != "dane" or drink == "tea",
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("nationality%d" % i, "drink%d" % i))
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# Hint 4
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if i < 5:
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problem.addConstraint(lambda colora, colorb:
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colora != "green" or colorb == "white",
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("color%d" % i, "color%d" % (i+1)))
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else:
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problem.addConstraint(lambda color: color != "green",
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("color%d" % i,))
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# Hint 5
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problem.addConstraint(lambda color, drink:
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color != "green" or drink == "coffee",
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("color%d" % i, "drink%d" % i))
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# Hint 6
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problem.addConstraint(lambda smoke, pet:
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smoke != "pallmall" or pet == "birds",
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("smoke%d" % i, "pet%d" % i))
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# Hint 7
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problem.addConstraint(lambda color, smoke:
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color != "yellow" or smoke == "dunhill",
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("color%d" % i, "smoke%d" % i))
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# Hint 8
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if i == 3:
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problem.addConstraint(lambda drink: drink == "milk",
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("drink%d" % i,))
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# Hint 9
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if i == 1:
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problem.addConstraint(lambda nationality:
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nationality == "norwegian",
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("nationality%d" % i,))
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# Hint 10
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if 1 < i < 5:
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problem.addConstraint(lambda smoke, peta, petb:
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smoke != "blends" or peta == "cats" or
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petb == "cats",
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("smoke%d" % i, "pet%d" % (i-1),
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"pet%d" % (i+1)))
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else:
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problem.addConstraint(lambda smoke, pet:
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smoke != "blends" or pet == "cats",
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("smoke%d" % i,
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"pet%d" % (i == 1 and 2 or 4)))
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# Hint 11
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if 1 < i < 5:
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problem.addConstraint(lambda pet, smokea, smokeb:
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pet != "horses" or smokea == "dunhill" or
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smokeb == "dunhill",
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("pet%d" % i, "smoke%d" % (i-1),
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"smoke%d" % (i+1)))
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else:
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problem.addConstraint(lambda pet, smoke:
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pet != "horses" or smoke == "dunhill",
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("pet%d" % i,
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"smoke%d" % (i == 1 and 2 or 4)))
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# Hint 12
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problem.addConstraint(lambda smoke, drink:
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smoke != "bluemaster" or drink == "beer",
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("smoke%d" % i, "drink%d" % i))
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# Hint 13
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problem.addConstraint(lambda nationality, smoke:
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nationality != "german" or smoke == "prince",
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("nationality%d" % i, "smoke%d" % i))
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# Hint 14
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if 1 < i < 5:
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problem.addConstraint(lambda nationality, colora, colorb:
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nationality != "norwegian" or
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colora == "blue" or colorb == "blue",
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("nationality%d" % i, "color%d" % (i-1),
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"color%d" % (i+1)))
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else:
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problem.addConstraint(lambda nationality, color:
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nationality != "norwegian" or
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color == "blue",
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("nationality%d" % i,
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"color%d" % (i == 1 and 2 or 4)))
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# Hint 15
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if 1 < i < 5:
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problem.addConstraint(lambda smoke, drinka, drinkb:
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smoke != "blends" or
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drinka == "water" or drinkb == "water",
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("smoke%d" % i, "drink%d" % (i-1),
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"drink%d" % (i+1)))
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else:
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problem.addConstraint(lambda smoke, drink:
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smoke != "blends" or drink == "water",
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("smoke%d" % i,
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"drink%d" % (i == 1 and 2 or 4)))
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solutions = problem.getSolutions()
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print "Found %d solution(s)!" % len(solutions)
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print
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for solution in solutions:
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showSolution(solution)
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def showSolution(solution):
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for i in range(1,6):
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print "House %d" % i
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print "--------"
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print "Nationality: %s" % solution["nationality%d" % i]
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print "Color: %s" % solution["color%d" % i]
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print "Drink: %s" % solution["drink%d" % i]
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print "Smoke: %s" % solution["smoke%d" % i]
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print "Pet: %s" % solution["pet%d" % i]
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print
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if __name__ == "__main__":
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main()
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