147 lines
3.9 KiB
C++
147 lines
3.9 KiB
C++
/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
|
|
/*
|
|
* Main authors:
|
|
* Guido Tack <tack@gecode.org>
|
|
*
|
|
* Copyright:
|
|
* Guido Tack, 2004
|
|
*
|
|
* This file is part of Gecode, the generic constraint
|
|
* development environment:
|
|
* http://www.gecode.org
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
*/
|
|
|
|
#include <gecode/driver.hh>
|
|
#include <gecode/int.hh>
|
|
#include <gecode/minimodel.hh>
|
|
#include <gecode/set.hh>
|
|
|
|
using namespace Gecode;
|
|
|
|
/**
|
|
* \brief %Options for %Hamming problems
|
|
*
|
|
*/
|
|
|
|
class HammingOptions : public Options {
|
|
private:
|
|
/// Number of bits
|
|
Driver::UnsignedIntOption _bits;
|
|
/// Minimum distance
|
|
Driver::UnsignedIntOption _distance;
|
|
/// Number of symbols
|
|
Driver::UnsignedIntOption _size;
|
|
|
|
public:
|
|
/// Initialize options for example with name \a s
|
|
HammingOptions(const char* s, unsigned int bits0,
|
|
unsigned int distance0, unsigned int size0)
|
|
: Options(s),
|
|
_bits("bits","word size in bits",bits0),
|
|
_distance("distance","minimum distance",distance0),
|
|
_size("size","number of symbols",size0) {
|
|
add(_bits); add(_distance); add(_size);
|
|
}
|
|
|
|
/// Return number of bits
|
|
unsigned int bits(void) const { return _bits.value(); }
|
|
/// Return minimum distance
|
|
unsigned int distance(void) const { return _distance.value(); }
|
|
/// Return number of symbols
|
|
unsigned int size(void) const { return _size.value(); }
|
|
|
|
};
|
|
|
|
/**
|
|
* \brief %Example: Generating %Hamming codes
|
|
*
|
|
* Generate a Hamming code that fits in b-bit words to code n symbols where
|
|
* the Hamming distance between every two symbol codes is at least d.
|
|
* The Hamming distance between two words is the number of bit positions
|
|
* where they differ.
|
|
*
|
|
* \ingroup Example
|
|
*
|
|
*/
|
|
class Hamming : public Script {
|
|
private:
|
|
/// The hamming code
|
|
SetVarArray x;
|
|
public:
|
|
/// Actual model
|
|
Hamming(const HammingOptions& opt) :
|
|
Script(opt),
|
|
x(*this,opt.size(),IntSet::empty,1,opt.bits()) {
|
|
|
|
if (opt.trace() != 0)
|
|
trace(*this, x, opt.trace());
|
|
|
|
SetVarArgs cx(x.size());
|
|
|
|
for (int i=x.size(); i--;)
|
|
cx[i] = expr(*this, -x[i]);
|
|
|
|
for (int i=0; i<x.size(); i++)
|
|
for (int j=i+1; j<x.size(); j++)
|
|
rel(*this,
|
|
cardinality(x[j] & cx[i]) +
|
|
cardinality(x[i] & cx[j]) >= opt.distance());
|
|
|
|
branch(*this, x, SET_VAR_NONE(), SET_VAL_MIN_INC());
|
|
}
|
|
|
|
/// Print solution
|
|
virtual void
|
|
print(std::ostream& os) const {
|
|
for (int i=0; i<x.size(); i++) {
|
|
os << "\t[" << i << "] = " << x[i] << std::endl;
|
|
}
|
|
}
|
|
|
|
/// Constructor for copying \a s
|
|
Hamming(Hamming& s) : Script(s) {
|
|
x.update(*this, s.x);
|
|
}
|
|
/// Copy during cloning
|
|
virtual Space*
|
|
copy(void) {
|
|
return new Hamming(*this);
|
|
}
|
|
|
|
};
|
|
|
|
/** \brief Main-function
|
|
* \relates Hamming
|
|
*/
|
|
int
|
|
main(int argc, char* argv[]) {
|
|
HammingOptions opt("Hamming",20,3,32);
|
|
opt.parse(argc,argv);
|
|
Script::run<Hamming,DFS,HammingOptions>(opt);
|
|
return 0;
|
|
}
|
|
|
|
|
|
// STATISTICS: example-any
|
|
|