main.cpp

经典的用遗传算法解决TSP问题

/*
用遗传算法(GA)解决TSP（旅行商）问题
完成时间:2005.8.2
编译环境:VC7.1 (用VC6的话需要修改几处，要把hash_map改为map)

作者:西南科技大学   唐坤(sf.tk)
QQ: 226152161
Blog: blog.gameres.com/show.asp?BlogID=1450&column=0
E-mail: [e-mail]

ps:初学遗传算法，很多都不懂，程序还有很多不足，若你改进了别忘了告诉我
*/

#include "GA.h"
#include "o_time.h"
#include <iostream>
const int lchrom = 20;
float pcross = 0.65;     //交叉率
float pmutation = 0.2;  //变异率
int popsize = 300;      //种群大小	
int maxgen = 300;    //最大世代数	

int main()
{
	cout<<"*************用遗传算法解决TSP(旅行商)问题******************"<<endl;
	//用矩阵保存各城市间的路程开销
	/*float dist[lchrom][lchrom] = {{0,8,5,4,1,2,3,1,5,6},{8,0,4,6,7,1,6,5,4,1},{5,4,0,3,1,2,9,8,1,5},{4,6,3,0,2,1,8,1,9,6},{1,7,1,2,0,5,6,1,3,4},
	{2,1,2,1,5,0,7,3,2,8},{3,6,9,8,6,7,0,1,3,1},{1,5,8,1,1,3,1,0,9,2},{5,4,1,9,3,2,3,9,0,8},{6,1,5,6,4,8,1,2,8,0}};*/
	float dist[lchrom][lchrom] ={{0, 1, 4, 6, 8, 1, 3, 7, 2, 9, 7, 3, 4, 5, 8, 9, 2, 8, 2, 8},{1, 0, 7, 5, 3, 8, 3, 4, 2, 4, 4, 6, 2, 8, 2, 9, 4, 5, 2, 1},{4, 7, 0, 3, 8, 3, 7, 9, 1, 2, 5, 8, 1, 8, 9, 4, 7, 4, 8, 4},{6, 5, 3, 0, 3, 1, 5, 2, 9, 1, 3, 5, 7, 3, 4, 7, 3, 4, 5, 2},
	{8, 3, 8, 3, 0, 2, 3, 1, 4, 6, 3, 8, 4, 5, 2, 8, 1, 7, 4, 7},{1, 8, 3, 1, 2, 0, 3, 3, 9, 5, 4, 5, 2, 7, 3, 6, 2, 3, 7, 1},{3, 3, 7, 5, 3, 3, 0, 7, 5, 9, 3, 4, 5, 9, 3, 7, 3, 2, 8, 1},{7, 4, 9, 2, 1, 3, 7, 0, 1, 3, 4, 5, 2, 7, 6, 3, 3, 8, 3, 5},
	{2, 2, 1, 9, 4, 9, 5, 1, 0, 1, 3, 4, 7, 3, 7, 5, 9, 2, 1, 7},{9, 4, 2, 1, 6, 5, 9, 3, 1, 0, 3, 7, 3, 7, 4, 9, 3, 5, 2, 5},{7, 4, 5, 3, 3, 4, 3, 4, 3, 3, 0, 5, 7, 8, 4, 3, 1, 5, 9, 3},{3, 6, 8, 5, 8, 5, 4, 5, 4, 7, 5, 0, 8, 3, 1, 5, 8, 5, 8, 3},
	{4, 2, 1, 7, 4, 2, 5, 2, 7, 3, 7, 8, 0, 5, 7, 4, 8, 3, 5, 3},{5, 8, 8, 3, 5, 7, 9, 7, 3, 7, 8, 3, 5, 0, 8, 3, 1, 8, 4, 5},{8, 2, 9, 4, 2, 3, 3, 6, 7, 4, 4, 1, 7, 8, 0, 4, 2, 1, 8, 4},{9, 9, 4, 7, 8, 6, 7, 3, 5, 9, 3, 5, 4, 3, 4, 0, 4, 1, 8, 4},
	{2, 4, 7, 3, 1, 2, 3, 3, 9, 3, 1, 8, 8, 1, 2, 4, 0, 4, 3, 7},{8, 5, 4, 4, 7, 3, 2, 8, 2, 5, 5, 5, 3, 8, 1, 1, 4, 0, 2, 6},{2, 2, 8, 5, 4, 7, 8, 3, 1, 2, 9, 8, 5, 4, 8, 8, 3, 2, 0, 4},{8, 1, 4, 2, 7, 1, 1, 5, 7, 5, 3, 3, 3, 5, 4, 4, 7, 6, 4, 0}};
	vector<vector<float> > map(lchrom);
	vector<float> tmp(lchrom);
	for(int i=0;i<lchrom;++i)
	{
		tmp.assign(dist[i],dist[i]+lchrom);
		map[i] = tmp;
	}
	pair<vector<int>,float> result;

	//输出配置信息
	cout<<"\n染色体长度:"<<lchrom<<"\n种群大小:"<<popsize<<"\n交叉率:"<<pcross<<"\n变异率:"<<pmutation;
	cout<<"\n最大世代数:"<<maxgen<<endl;

	//输出路径信息
	cout<<endl<<"  ";
	for(int i=0;i<lchrom;i++)
		cout<<i<<" ";
	cout<<endl;		
	for(int i=0;i<lchrom;i++)
	{
		cout<<i<<":";
		for(int j=0;j<lchrom;j++)
		{
			cout<<map[i][j]<<" ";
		}
		cout<<endl;
	}
	cout<<endl;	

	our::Time time; //测时对象
	//关键部分
	CGA ga;
	time.start();
	result = ga.start(map,pcross,pmutation,popsize,maxgen);
	//
	time.end();
	cout<<"耗时:"<<time.time_milli()<<" s"<<endl<<"最优路径:";
	copy(result.first.begin(), result.first.end(), ostream_iterator<int>(cout,"->"));
	cout<<endl<<"开销:"<<result.second<<endl;

	system("pause");
	return 0;
}