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PROBLEM 2 : FILE ORDERING

MARKS 100

You are developing big software that requires installation of some setup files. These

setup files may be platform-specific or platform independent. By platform specific we

mean that file can be installed only to that platform. Platform Independent files can be

installed to any platform. Platform is indicated by platform string like P1 (OS = Linux,

Processor = Intel Pentium IV).

A file c an depend on other files. If File1 depends on File2, this means that File1 can be

installed only when File2 is already installed.

INPUT:

The input begins with a line containing a number indicating number of files to be

installed.

Then for each file, the inputs will be

i) The platform on which the given file will run

ii) The file(s) on which the given file depends.

For an example the structure of a file with the following inputs can be like:

File 1 P1

File2

File3

File4

This means that File1 is specific for platform P1 and it depends on File2, File3 and File4and not vice versa i.e. File2, File3 and File4 should not depend on File1 and File1 can

only run when the other three files are already installed.

It also implies that File2, File3 and File4 can be platform independent or should run on P1

otherwise the input given is not correc t.

File Structures will be separated by blank space.

OUTPUT:

The output of the given problem should be in the form of a comma separated ordered

list of files which are to be processed for each platform.P1::File2, File3, File4, File1

This means for a platform P1 the files must be executed in this order.

It is possible that there is a cycle that produces deadlock. In that case you have to print

in this way.P1::A cycle is detected

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Cycle can be in this form:-

File1File2File1

This means that File1 can be installed only if File2 is already installed and File2 can be

installed if File1 is already installed causing a deadloc k.NOTE: For particular platform, there can be more than one ordered list of files which

are to be executed. In that case you have to print only one correc t sequence.

Sample Input:

10

File1::General

File2

File2::General

File3::P1File1File2

File4

File4::P1

File1

File5::P2

File1File2File6File7

File8

File6::P2

File8

File7::P2File2

File8::P2

File9::P3File1

File2File10

File10::P3File1File2

Output for the Sample Input:P1::File2, File1, File4, File3P2::File2, File1, File7, File8, File6, File5P3::File2, File1, File10, File9

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