mirror of
https://github.com/BlackLight/libCSP--.git
synced 2024-12-26 18:55:11 +01:00
96 lines
4.6 KiB
Text
96 lines
4.6 KiB
Text
========================================
|
|
_ _ _ ____ ____ ____
|
|
| (_) |__ / ___/ ___|| _ \ _ _
|
|
| | | '_ \| | \___ \| |_) || |_ _| |_
|
|
| | | |_) | |___ ___) | __/_ _|_ _|
|
|
|_|_|_.__/ \____|____/|_| |_| |_|
|
|
========================================
|
|
|
|
|
|
libCSP++ is a small library whose purpose is allowing the programmer who has to
|
|
manage constraint-related problems (CSP == Constraint Satisfaction Problem), in
|
|
artificial intelligence or any other application, to do it easily, just caring
|
|
about how to express the constraints of his own problem, not how to write an
|
|
algorithm that verifies those constraints. The programmer only has to focus
|
|
three parameters: the variables of the problem (e.g., in a sudoku resolution
|
|
algorithm, each cell of the game may represent a variable), the domains of these
|
|
variables (e.g., in a sudoku, each cell may assume values from 1 to 9) and the
|
|
constraints of the problem, simply provided like one or more boolean functions
|
|
(always in a sudoku, the constraints are represented by a boolean function
|
|
returning true if all the variables in the same row, column and cell have
|
|
different values, false otherwise). Once focused these features, the programmer
|
|
just has to provide them to build a CSP object, without caring of the algorithm
|
|
to check the satisfiability of his problem, and so pay his attention to *HIS*
|
|
own algorithm.
|
|
|
|
|
|
INSTALLATION:
|
|
|
|
Just type make install. The files will be copied, by default, to /usr/local.
|
|
Change the Makefile if you want them in a different location. No additional
|
|
dependency is required. Only a C++ compiler.
|
|
|
|
|
|
USAGE:
|
|
|
|
Just include <csp++/csp++.h> in your source files using libCSP++, possibly
|
|
adding the directory where csp++ directory is located to your include list (for
|
|
example, using g++ and supposing you installed csp++ to /usr/local, you would
|
|
append -I/usr/local/include to your compiler command line).
|
|
|
|
|
|
DOCUMENTATION:
|
|
|
|
You can find doxygen-generated documentation, both in HTML and LaTeX format, in
|
|
the doc/ directory of the project. If you modify some of the sources files of
|
|
the library and want to change the documentation, just move to csp++ directory
|
|
and launch `doxygen' command again.
|
|
|
|
|
|
EXAMPLES:
|
|
|
|
Two examples of usage of the library are provided.
|
|
|
|
- fourcolours.cpp is a simple application whose purpose is to interactively ask the
|
|
user to enter the colours for some European countries. The constraint is that two
|
|
adjacent countries on the map cannot have the same colour, and the domain of
|
|
each variable (country) is the set of colours it can assume (a set of 4 colours
|
|
is used, it has been proved in the chromatic theory of graphs that 4 colours are
|
|
enough for satisfying the constraint "two adjacent countries must always have
|
|
different colours"). Every time the user inserts the colour for a country, the
|
|
domains (colours) of the remaining countries are computed again applying the
|
|
constraint just entered by the user, and for the next countries the choice of
|
|
the colours is only restricted to these computed domains. If the user has to
|
|
choose a colour for a country having an only value left in its domain, that
|
|
value will be chosen automatically.
|
|
|
|
- sudoku.cpp is a nice program that automatically solves a sudoku, theoretically by
|
|
any size (in truth the complexity of the algorithm rises exponentially when the
|
|
size of the sudoku grows, and the required time for the algorithm is also
|
|
inversely proportional to the number of variables already set by default in the
|
|
game). The sudoku to be solved is read by a text file. If no file is provided,
|
|
the program reads the sudoku contained in ./sudoku.txt. More examples are
|
|
provided in files sudoku-easy.txt, sudoku-medium.txt, sudoku-hard.txt and
|
|
sudoku-2x2x2.txt. If you want to solve a sudoku different by the one provided in
|
|
sudoku.txt, just put the new sudoku in a file whose structure is similar to the
|
|
one illustrated in the sample files, and pass it as parameter for the
|
|
application (e.g. ./sudoku mysudoku.txt). The application will verify whether
|
|
the given game has a solution (unique), is indeterminate (the given variables
|
|
are not enough for reaching a unique solution) or impossible (any configuration
|
|
leads to a violation of the constraints).
|
|
|
|
For building the examples, from the root directory of the project just type
|
|
`make examples'. For removing them, type `make examples-clean'. For building
|
|
only one of them, type `make fourcolours' or `make sudoku', and specularly `make
|
|
fourcolours-clean' or `make sudoku-clean'.
|
|
|
|
|
|
LICENCE:
|
|
|
|
All the source code and examples are released under GNU GPL 3 licence.
|
|
|
|
|
|
AUTHOR:
|
|
|
|
BlackLight, <blacklight[AT]autistici[DOT]org>, http://0x00.ath.cx
|
|
|