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- [code]https://blog.csdn.net/fulongxu/article/details/99678958?ops_request_misc=&request_id=&biz_id=102&utm_term=c++%20%E8%9A%81%E7%BE%A4%E7%AE%97%E6%B3%95&utm_medium=distribute.pc_search_result.none-task-blog-2~blog~sobaiduweb~default-5-99678958.nonecase&spm=1018.2226.3001.4450
复制代码 [/code]
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- #include<bits/stdc++.h>
- #define Read() freopen("data.in","r",stdin)
- #define Write() freopen("autocomplete.out","w",stdout)
- using namespace std;
- const int City_Num = 48;//城市数目
- const int Ant_Num = 20;//蚂蚁数目
- const int Total_Num = 2000;//迭代次数
- double Distance[City_Num+5][City_Num+5];//保存距离
- vector<int> Edge[City_Num+5][City_Num+5];//保存每条边有哪些蚂蚁走过
- double Ant_length[Ant_Num+5];//保存每只蚂蚁一轮后走过的路径长度
- double Edge_Info[City_Num+5][City_Num+5];//保存每条边的信息素
- vector<int> Ant[Ant_Num+5];//保存每个蚂蚁的路径
- int vis[Ant_Num+5][City_Num+5];//标记每个蚂蚁走过哪个城市
- double Total_Length[Ant_Num+5];//记录每轮迭代后每只蚂蚁走的总路长
- vector<int> Min_Path;
- double Alpha = 1.0;
- double Beta = 5.0;
- double Rho = 0.5;
- double Min_Length = 0x3f3f3f3f;
- struct node
- {
- int x, y;
- }Node[City_Num+5];
- double Get_distance(node a, node b)
- {
- return sqrt((1.0*(a.x-b.x)*(a.x-b.x) + 1.0*(a.y-b.y)*(a.y-b.y))/10.0);
- }
- void Init()
- {
-
- for(int i = 0; i < City_Num; i++)
- {
- Distance[i][i] = 0;
- Edge_Info[i][i] = 0;
- for(int j = i+1; j < City_Num; j++)
- {
- Distance[i][j] = Get_distance(Node[i], Node[j]);
- Distance[j][i] = Distance[i][j];
- Edge_Info[i][j] = 0.1;
- Edge_Info[j][i] = 0.1;
- }
- }
- }
- int Rand()
- {
- return rand()%48;
- }
- double Rand_Double()
- {
- return (rand()%10000)/10000.0;
- }
- void Build_Path()
- {
- for(int i = 0; i < Ant_Num; i++)
- {
- while(Ant[i].size() != City_Num)
- {
- double sum = 0.0;
- double p_go[City_Num+5];//计算访问下一个城市的概率
- memset(p_go, 0, sizeof(p_go));
-
- int total_pos = Ant[i].size();
- int now_pos = Ant[i][total_pos-1];
-
- for(int j = 0; j < City_Num; j++)
- {
- if(vis[i][j]) continue;
- p_go[j] = pow(Edge_Info[now_pos][j], Alpha)*pow((1.0/Distance[now_pos][j]), Beta);
- sum += p_go[j];
- }
-
- double p = Rand_Double();
- double p_total = 0;
-
- for(int j = 0; j < City_Num; j++)
- {
- if(vis[i][j]) continue;
-
- if(p_total+(p_go[j]/sum) >= p)//下一个访问的城市是j
- {
- vis[i][j] = 1;//标记该城市已经走过
- Ant[i].push_back(j);//把这个城市加到城市列表中
- Total_Length[i] += Distance[now_pos][j];//计算第i只蚂蚁当前一共走的距离
- Edge[now_pos][j].push_back(i);//记录走过这条边的蚂蚁,用来更新信息素矩阵
- break;
- }
- else
- {
- p_total += (p_go[j]/sum);
- }
- }
- }
- Total_Length[i] += Distance[Ant[i][City_Num-1]][Ant[i][0]];//将终点到起点的路长加入到总路长中
- Edge[Ant[i][City_Num-1]][Ant[i][0]].push_back(i);//终点指向起点的路的蚂蚁记录一下
- if(Min_Length > Total_Length[i])//寻找全局最短路径,并记录路径
- {
- Min_Length = Total_Length[i];
- Min_Path.clear();
- for(int k = 0; k < City_Num; k++)
- Min_Path.push_back(Ant[i][k]);
- Min_Path.push_back(Ant[i][0]);
- }
- }
- }
- double Get_Edge_P(int x, int y)
- {
- int n = Edge[x][y].size();
- double sum = 0.0;
- for(int i = 0; i < n; i++)
- {
- int ant = Edge[x][y][i];
- sum += 1.0/Total_Length[ant];
- }
- return sum;
- }
- void Change_Info()
- {
- for(int i = 0; i < City_Num; i++)
- {
- for(int j = i+1; j < City_Num; j++)
- {
- double edge_p = Get_Edge_P(i, j);
- Edge_Info[i][j] = (1.0-Rho)*Edge_Info[i][j] + edge_p;
- Edge_Info[i][j] = Edge_Info[j][i];
- }
- }
- }
- void Print()
- {
- cout<<Min_Length<<endl;
- for(int i = 0; i < City_Num; i++)
- cout<<Min_Path[i]<<"-->";
- cout<<Min_Path[City_Num]<<endl;
- }
- int main()
- {
- srand(time(NULL));
- Read();
- for(int i = 0; i < City_Num; i++)
- {
- int num, x, y;
- cin >>num>>x>>y;
- Node[i].x = x;
- Node[i].y = y;
- }
-
- for(int i = 0; i < 48; i++)
- cout<<i+1<<" "<<Node[i].x<<" "<<Node[i].y<<endl;
- cout<<endl<<endl;
-
- Init();
- int T = Total_Num;
-
- while(T--)
- {
- memset(vis, 0, sizeof(vis));
- for(int i = 0; i < Ant_Num; i++)
- {
- Ant[i].clear();
- Total_Length[i] = 0;
- }
-
- for(int i = 0; i < Ant_Num; i++)
- {
- int start_city = Rand();
- vis[i][start_city] = 1;
- Ant[i].push_back(start_city);
- }
-
- Build_Path();//构建路径
- Change_Info();//信息素更新
- }
-
- Print();//打印最优路径
-
- return 0;
- }
复制代码 |
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