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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- *//* * Main authors: * Guido Tack <tack@gecode.org> * Christian Schulte <schulte@gecode.org> * * Copyright: * Guido Tack, 2004 * Christian Schulte, 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/set.hh>
using namespace Gecode;
namespace { /// The airline employees typedef enum { Tom, David, Jeremy, Ron, Joe, Bill, Fred, Bob, Mario, Ed, Carol, Janet, Tracy, Marilyn, Carolyn, Cathy, Inez, Jean, Heather, Juliet } Employee; const int noOfEmployees = Juliet+1;
/// A flight to schedule struct Flight { int staff; ///< Overall number of cabin crew needed int stewards; ///< How many stewards are required int hostesses; ///< How many hostesses are required int french; ///< How many French speaking employees are required int spanish; ///< How many Spanish speaking employees are required int german; ///< How many German speaking employees are required };
const char* employeeToName(Employee e); extern const int stewards[]; extern const int noOfStewards; extern const int hostesses[]; extern const int noOfHostesses; extern const int spanishSpeaking[]; extern const int noOfSpanishSpeaking; extern const int frenchSpeaking[]; extern const int noOfFrenchSpeaking; extern const int germanSpeaking[]; extern const int noOfGermanSpeaking; extern const Flight requiredCrew[]; extern const int noOfFlights;}
/** * \brief %Example: Airline crew allocation * * Assign 20 flight attendants to 10 flights. Each flight needs a certain * number of cabin crew, and they have to speak certain languages. * Every cabin crew member has two flights off after an attended flight. * * \ingroup Example * */class Crew : public Script {public: /// The crew for each flight SetVarArray flight;
/// The actual model Crew(const Options& opt) : Script(opt), flight(*this,noOfFlights,IntSet::empty,0,noOfEmployees-1) { IntSet stewardsDS(stewards,noOfStewards); IntSet hostessesDS(hostesses,noOfHostesses); IntSet spanishDS(spanishSpeaking, noOfSpanishSpeaking); IntSet frenchDS(frenchSpeaking, noOfFrenchSpeaking); IntSet germanDS(germanSpeaking, noOfGermanSpeaking);
for (int i=0; i<noOfFlights; i++) { // The flight has staff as required by the specification rel(*this, cardinality(flight[i]) == requiredCrew[i].staff);
// Enough members of different categories are on board rel(*this, cardinality(flight[i] & stewardsDS) >= requiredCrew[i].stewards); rel(*this, cardinality(flight[i] & hostessesDS) >= requiredCrew[i].hostesses); rel(*this, cardinality(flight[i] & spanishDS) >= requiredCrew[i].spanish); rel(*this, cardinality(flight[i] & frenchDS) >= requiredCrew[i].french); rel(*this, cardinality(flight[i] & germanDS) >= requiredCrew[i].german); }
// No crew member of flight i works on flights i+1 and i+2 for (int i=0; i<noOfFlights-2; i++) { rel(*this, flight[i] || flight[i+1]); rel(*this, flight[i] || flight[i+2]); } rel(*this, flight[noOfFlights-2] || flight[noOfFlights-1]);
branch(*this, flight, SET_VAR_NONE(), SET_VAL_MIN_INC()); }
/// Print solution virtual void print(std::ostream& os) const { for (int i=0; i<noOfFlights; i++) { os << "\tFlight " << i+1 << ":" << std::endl; os << "\t\tCrew\tStew.\tHost.\tFrench\tSpanish\tGerman" << std::endl << "\t"; os << "\t" << requiredCrew[i].staff << "\t" << requiredCrew[i].stewards << "\t" << requiredCrew[i].hostesses << "\t" << requiredCrew[i].spanish << "\t" << requiredCrew[i].french << "\t" << requiredCrew[i].german << std::endl;
os << "\t\tSchedule:" << std::endl << "\t\t"; if (flight[i].assigned()) { for (SetVarGlbValues d(flight[i]);d();++d) { os << employeeToName(static_cast<Employee>(d.val())) << " "; } } else { os << "\tRequired: "; for (SetVarGlbValues d(flight[i]);d();++d) { os << employeeToName(static_cast<Employee>(d.val())) << " "; } os << std::endl << "\t\t\tPossible: "; for (SetVarUnknownValues d(flight[i]);d();++d) { os << employeeToName(static_cast<Employee>(d.val())) << " "; } } os << std::endl << std::endl; } }
/// Constructor for cloning \a s Crew(Crew& s) : Script(s) { flight.update(*this, s.flight); } /// Copy during cloning virtual Space *copy(void) { return new Crew(*this); }
};
/** \brief Main-function * \relates Crew */intmain(int argc, char* argv[]) { Options o("Crew"); o.iterations(100); o.parse(argc,argv); Script::run<Crew,DFS,Options>(o); return 0;}
namespace {
/// Return name of employee \a e as a string const char* employeeToName(Employee e) { switch(e) { case Tom : return "Tom"; case David : return "David"; case Jeremy: return "Jeremy"; case Ron: return "Ron"; case Joe: return "Joe"; case Bill: return "Bill"; case Fred: return "Fred"; case Bob: return "Bob"; case Mario: return "Mario"; case Ed: return "Ed"; case Carol: return "Carol"; case Janet: return "Janet"; case Tracy: return "Tracy"; case Marilyn: return "Marilyn"; case Carolyn: return "Carolyn"; case Cathy: return "Cathy"; case Inez: return "Inez"; case Jean: return "Jean"; case Heather: return "Heather"; case Juliet: return "Juliet"; default: GECODE_NEVER; return ""; } }
// these have to be sorted! /// The stewards const int stewards[] = {Tom, David, Jeremy, Ron, Joe, Bill, Fred, Bob, Mario, Ed}; /// The number of stewards const int noOfStewards = sizeof(stewards) / sizeof(int); /// The hostesses const int hostesses[] = { Carol, Janet, Tracy, Marilyn, Carolyn, Cathy, Inez, Jean, Heather, Juliet }; /// The number of hostesses const int noOfHostesses = sizeof(hostesses) / sizeof(int); /// The French speaking employees const int frenchSpeaking[] = { Bill, Inez, Jean, Juliet }; /// The number of French speaking employees const int noOfFrenchSpeaking = sizeof(frenchSpeaking) / sizeof(int); /// The German speaking employees const int germanSpeaking[] = { Tom, Jeremy, Mario, Cathy, Juliet }; /// The number of German speaking employees const int noOfGermanSpeaking = sizeof(germanSpeaking) / sizeof(int); /// The Spanish speaking employees const int spanishSpeaking[] = { Joe, Bill, Fred, Mario, Marilyn, Inez, Heather }; /// The number of Spanish speaking employees const int noOfSpanishSpeaking = sizeof(spanishSpeaking) / sizeof(int);
/// The flights to schedule const Flight requiredCrew[] = { {4,1,1,1,1,1}, {5,1,1,1,1,1}, {5,1,1,1,1,1}, {6,2,2,1,1,1}, {7,3,3,1,1,1}, {4,1,1,1,1,1}, {5,1,1,1,1,1}, {6,1,1,1,1,1}, {6,2,2,1,1,1}, {7,3,3,1,1,1} };
/// The number of flights to schedule const int noOfFlights = sizeof(requiredCrew) / sizeof(Flight);}
// STATISTICS: example-any