所以我想找到这张图上任意两个节点之间的最短距离,我知道实现这个想法所需的算法,但我不确定我将如何去做。我将邻接列表创建为一个 ArrayList,其中包含一个 startValue、EndValue 和一个权重。例如: Banstead 是节点 1,它被创建为一个对象: CreateNode(1,2,4) 所以从 Banstead 到 Coulsdon 的成本是节点 1 和节点 2 之间的 4。
这是代码
package map;
import java.util.ArrayList;
class Edge {
int startVertex;
int endVertex;
int weight;
public Edge(int start, int end, int weight){
this.startVertex = start;
this.endVertex = end;
this.weight = weight;
}
}
public class Map {
public static void main(String[] args) {
int vertex = 17;
int[][] matrix = new int[vertex+1][vertex+1];
ArrayList<Edge> edgeList = new ArrayList<Edge>();
edgeList.add(new Edge(1,2,4));edgeList.add(new Edge(1,17,3));
edgeList.add(new Edge(2,1,4));edgeList.add(new Edge(2,4,4));edgeList.add(new Edge(2,10,5));
edgeList.add(new Edge(3,4,1));edgeList.add(new Edge(3,6,5));
edgeList.add(new Edge(4,2,4));edgeList.add(new Edge(4,3,1));edgeList.add(new Edge(4,5,2));
edgeList.add(new Edge(5,4,2));edgeList.add(new Edge(5,6,3));edgeList.add(new Edge(5,9,4));edgeList.add(new Edge(5,10,5));
edgeList.add(new Edge(6,3,5));edgeList.add(new Edge(6,5,3));edgeList.add(new Edge(6,7,2));
edgeList.add(new Edge(7,6,2));edgeList.add(new Edge(7,8,5));
edgeList.add(new Edge(8,7,5));edgeList.add(new Edge(8,9,4));edgeList.add(new Edge(8,12,5));
edgeList.add(new Edge(9,5,4));edgeList.add(new Edge(9,7,4));edgeList.add(new Edge(9,12,5));
edgeList.add(new Edge(10,2,5));edgeList.add(new Edge(10,5,5));edgeList.add(new Edge(10,13,1));edgeList.add(new Edge(10,14,3));
edgeList.add(new Edge(11,9,4));edgeList.add(new Edge(11,12,3));edgeList.add(new Edge(11,13,3));
edgeList.add(new Edge(12,8,5));edgeList.add(new Edge(12,11,3));edgeList.add(new Edge(12,14,4));
edgeList.add(new Edge(13,8,5));edgeList.add(new Edge(13,11,3));edgeList.add(new Edge(13,14,4));
edgeList.add(new Edge(14,10,1));edgeList.add(new Edge(14,11,3));
edgeList.add(new Edge(15,12,4));edgeList.add(new Edge(15,14,5));edgeList.add(new Edge(15,16,9));
edgeList.add(new Edge(16,13,9));edgeList.add(new Edge(16,17,1));
edgeList.add(new Edge(17,1,3));edgeList.add(new Edge(17,16,1));
for(int i=0; i<edgeList.size(); i++){
Edge currentEdge = edgeList.get(i);
int startVertex = currentEdge.startVertex;
int endVertex = currentEdge.endVertex;
int weight = currentEdge.weight;
matrix[startVertex][endVertex] = weight;
}
for(int i=1; i<=vertex; i++){
for(int j=1; j<=vertex; j++){
System.out.print(matrix[i][j]);
}
System.out.println();
}
}
}
输出只是邻接列表的显示:
04000000000000003
40040000050000000
00010500000000000
04102000000000000
00020300450000000
00503020000000000
00000205000000000
00000050400500000
... 等等。
我如何实现一种算法来找到任意两个随机节点之间的最短路径,比如 Banstead 和 Horley。谢谢。