National University of Singapore

Who owns the Amiga?

In a corridor in a student dormitory, there are five rooms numbered 1, 2, 3, 4 and 5; room number 1 is the left-most room, and room number 5 is the right-most. The rooms have doors in different colours: blue, green, red, white and yellow, but not necessarily in that order.

\includegraphics[width=0.9\textwidth ]{doors}


Photo by Bill Bertram(Wikimedia Commons)




The input consists of several scenarios. The first input line contains a number 1-1000 indicating how many scenarios there are.

Each scenario starts with a line with a number 1-2000 telling how many fact lines there are for that scenario. Then follow the fact lines which each contains three words separated by one or more spaces:

  • The first and third word is one of these names:

            1 2 3 4 5
            blue green red white yellow
            anna bernhard chris david ellen
            danish finnish icelandic norwegian swedish
            amiga atari linux mac windows
            c c++ java pascal perl 

    (Note that no uppercase letters are used.)

  • The second word specifies a relationship; it is one of

            same-as left-of right-of next-to

    same-as tells that the first and third fact words apply to the same room; for instance "blue same-as bernhard" tells that Bernhard lives in the room with a blue door.

    left-of tells that the first fact word applies to the room immediately to the left of the one to which the third fact word applies. For example, "chris left-of perl" means that Chris lives in the room immediately to the left of the Perl programmer.

    right-of tells that the first factword applies to the room immediately to the right of the one to which the third fact word applies.

    next-to tells that the two fact words apply to rooms next to each other. For example, "swedish next-to linux" means that the Swedish student lives in the next room (either to the left or the right) of the owner of the Linux computer.


For each scenario, you should print a line starting with

        scenario #n:

where n is the scenario number. If the input data is inconsistent (i.e. at least one of the facts must be false), continue the line with



        xxxx owns the amiga.

or, if you cannot name the Amiga owner, you print

        cannot identify the amiga owner.
Sample Input 1 Sample Output 1
red same-as 1
danish same-as 1
perl same-as 5
atari same-as 2
linux same-as 3
mac same-as 4
windows same-as 5
anna same-as 1
chris left-of amiga
chris left-of 4
c same-as 1
danish same-as 1
red same-as 1
linux same-as red
windows next-to linux
mac left-of swedish
scenario #1: anna owns the amiga.
scenario #2: cannot identify the amiga owner.