acoc++.txt

蚂蚁算法程序

＃i nclude <iostream>
＃i nclude <fstream>
＃i nclude <math.h>
＃i nclude <time.h> 
using namespace std;

const int iAntCount=34;//ant numbers
const int iCityCount=51;
const int iItCount=2000;
const double Q=100;
const double alpha=1;
const double beta=5;
const double rou=0.5;
int besttour[iCityCount];
double rnd(int low,double uper)
{
double p=(rand()/(double)RAND_MAX)*((uper)-(low))+(low);
return (p);
};
int rnd(int uper)
{
return (rand()%uper);
};
class GInfo
{
public: 
double m_dDeltTrial[iCityCount][iCityCount];
double m_dTrial[iCityCount][iCityCount];
double distance[iCityCount][iCityCount];
};

GInfo Map;
class ant
{
private:
int ChooseNextCity();
double prob[iCityCount];
int m_iCityCount;
int AllowedCity[iCityCount];
public:
void addcity(int city);
int tabu[iCityCount];
void Clear();
void UpdateResult();
double m_dLength;
double m_dShortest;
void move();
ant();
void move2last();
};
void ant::move2last()
{
int i;
for(i=0;i<iCityCount;i++)
if (AllowedCity==1)
{
  addcity(i);
  break;
}
}
void ant::Clear()
{
m_dLength=0;
int i;
for(i=0;i<iCityCount;i++)
{
prob=0;
AllowedCity=1;
}
i=tabu[iCityCount-1];
m_iCityCount=0;
addcity(i);
}
ant::ant()
{
m_dLength=m_dShortest=0;
m_iCityCount=0;
int i;
for(i=0;i<iCityCount;i++)
{
AllowedCity=1;
prob=0;
}
}
void ant::addcity(int city)
{
//add city to tabu;
tabu[m_iCityCount]=city;
m_iCityCount++;
AllowedCity[city]=0;
}
int ant::ChooseNextCity()
{
//Update the probability of path selection
//select a path from tabu[m_iCityCount-1] to next

int i;
int j=10000;
double temp=0;
int curCity=tabu[m_iCityCount-1];
for (i=0;i<iCityCount;i++)
{
if((AllowedCity==1)) 
{
  temp+=pow((1.0/Map.distance[curCity]),beta)*pow((Map.m_dTrial[curCity]),alpha);
}
}
double sel=0;
for (i=0;i<iCityCount;i++)
{ 
if((AllowedCity==1))
{
  prob=pow((1.0/Map.distance[curCity]),beta)*pow((Map.m_dTrial[curCity]),alpha)/temp;
  sel+=prob;
}
else 
  prob=0;
}
double mRate=rnd(0,sel);
double mSelect=0;
for ( i=0;i<iCityCount;i++)
{
if((AllowedCity==1))
  mSelect+=prob ;
if (mSelect>=mRate) {j=i;break;}
}
if (j==10000)
{
temp=-1;
for (i=0;i<iCityCount;i++)
{ 
  if((AllowedCity==1))
  if (temp<pow((1.0/Map.distance[curCity]),beta)*pow((Map.m_dTrial[curCity]),alpha))   
  {
  temp=pow((1.0/Map.distance[curCity]),beta)*pow((Map.m_dTrial[curCity]),alpha);
  j=i;
  }
}
}
return j;
}
void ant::UpdateResult()
{
// Update the length of tour
int i;
for(i=0;i<iCityCount-1;i++)
m_dLength+=Map.distance[tabu][tabu[i+1]];
m_dLength+=Map.distance[tabu[iCityCount-1]][tabu[0]];
}
void ant::move()
{
//the ant move to next town and add town ID to tabu.
int j;
j=ChooseNextCity();
addcity(j);
}
class project
{
public:
void UpdateTrial();
double m_dLength;
void initmap();
ant ants[iAntCount];
void GetAnt();
void StartSearch();
project();
};
void project::UpdateTrial()
{
//calculate the changes of trial information
int i;
int j;
for(i=0;i<iAntCount;i++)
{
for (j=0;j<iCityCount-1;j++)
{
  Map.m_dDeltTrial[ants.tabu[j]][ants.tabu[j+1]]+=Q/ants.m_dLength ;
  Map.m_dDeltTrial[ants.tabu[j+1]][ants.tabu[j]]+=Q/ants.m_dLength;
}
Map.m_dDeltTrial[ants.tabu[iCityCount-1]][ants.tabu[0]]+=Q/ants.m_dLength;
Map.m_dDeltTrial[ants.tabu[0]][ants.tabu[iCityCount-1]]+=Q/ants.m_dLength;
}
for (i=0;i<iCityCount;i++)
{
for (j=0;j<iCityCount;j++)
{
  Map.m_dTrial[j]=(rou*Map.m_dTrial[j]+Map.m_dDeltTrial[j] );
  Map.m_dDeltTrial[j]=0;
}
}

}
void project::initmap()
{
int i;
int j;
for(i=0;i<iCityCount;i++)
for (j=0;j<iCityCount;j++)
{
  Map.m_dTrial[j]=1;
  Map.m_dDeltTrial[j]=0;
}
}
project::project()
{
//initial map,read map infomation from file . et.
initmap();
m_dLength=10e9;

ifstream in("eil51.tsp");
struct city
{
int num;
int x;
int y;
}cc[iCityCount];

for (int i=0;i<iCityCount;i++)
{
in>>cc.num>>cc.x>>cc.y;
besttour=0;
}
int j;
for(i=0;i<iCityCount;i++)
for (j=0;j<iCityCount;j++)
{
  {
  Map.distance[j]=sqrt(pow((cc.x-cc[j].x),2)+pow((cc.y-cc[j].y),2));
  }
}

}
void project::GetAnt()
{
//randomly put ant into map
int i=0;
int city;
srand( (unsigned)time( NULL ) +rand());
for (i=0;i<iAntCount;i++)
{
city=rnd(iCityCount);
ants.addcity(city);
}
}
void project::StartSearch()
{
//begin to find best solution
int max=0;//every ant tours times
int i;
int j;
double temp;
int temptour[iCityCount];
while (max<iItCount)
{ 
for(j=0;j<iAntCount;j++) 
{ 
  for (i=0;i<iCityCount-1;i++)
  ants[j].move();
}
for(j=0;j<iAntCount;j++) 
{
  ants[j].move2last();
  ants[j].UpdateResult ();
}
//find out the best solution of the step and put it into temp
int t;
temp=ants[0].m_dLength;
for (t=0;t<iCityCount;t++)
  temptour[t]=ants[0].tabu[t];
for(j=0;j<iAntCount;j++) 
{
  if (temp>ants[j].m_dLength) {
  temp=ants[j].m_dLength;
  for ( t=0;t<iCityCount;t++)
  temptour[t]=ants[j].tabu[t];
  }
}
if(temp<m_dLength){
  m_dLength=temp;
  for ( t=0;t<iCityCount;t++)
  besttour[t]=temptour[t];
}
printf("%d : %f\n",max,m_dLength);
UpdateTrial(); 
for(j=0;j<iAntCount;j++) 
  ants[j].Clear();
max++;
}//while
printf("The shortest toure is : %f\n",m_dLength);
for ( int t=0;t<iCityCount;t++)
printf(" %d ",besttour[t]);
}
int main()
{
project TSP;
TSP.GetAnt();
TSP.StartSearch();
return 0;
}