java实现深度优先搜索 [英] java implementation of Depth First Search
问题描述
以下code没有错误,但我得到的输出是不正确的。
the following code has no errors,but the output i am getting is not correct
import java.io.*;
class dfs
{
static void dfs(int a[][], int m[], int i, int n)
{
int j;
System.out.println("\t" + (i+1));
m[i] = 1;
for(j=0; j<n; j++)
if(a[i][j]==1 && m[j]==0)
dfs(a,m,j,n);
}
public static void main(String args[]) throws IOException
{
int n, i, j;
System.out.println("No. of vertices : ");
BufferedReader br= new BufferedReader (new InputStreamReader(System.in));
n =Integer.parseInt(br.readLine());
int m[]= new int[n];
int a[][] = new int[n][n];
for (i=0; i<n; i++)
{
m[i] = 0;
}
System.out.println("\n\nEnter 1 if edge is present, 0 if not");
for (i=0; i<n; i++)
{
System.out.println("\n");
for (j=i; j<n; j++)
{
System.out.println("Edge between " + (i+1) + " and " + (j+1)+ " : ");
a[i][j] =Integer.parseInt(br.readLine());
a[j][i]=a[i][j];
}
a[i][i] = 0;
}
System.out.println("\nOrder of accessed nodes : \n");
for (i=0; i<n; i++)
if (m[i]==0)
dfs(a,m,i,n);
}
}
输出示例
No of vertices : 8
edges
1 2
1 3
2 4
2 5
3 6
3 7
4 8
5 8
6 8
7 8
DFS路径应该是:1 2 4 8 5 3 6 7
the DFS path should be : 1 2 4 8 5 3 6 7
我得到的输出为:1 2 4 8 5 6 3 7
the output i am getting is : 1 2 4 8 5 6 3 7
公告称,6日和7日的术语互换
notice that the 6 th and 7 th terms are interchanged
谁能告诉我如何纠正this.thanks对您有所帮助。
can anyone tell me how to correct this.thanks for your help
推荐答案
你得到的输出是一个无向图是正确的。你提供边缘的列表包括(6,8),但是一个DFS可以从8到6只以及6至8行进,因为它是无向。如果你想有向图,你将不得不作出在 A
数组如何设置一对夫妇的变化。
The output you're getting is correct for an undirected graph. The list of edges you provided includes (6,8), but a DFS can travel from 8 to 6 just as well as from 6 to 8 since it's undirected. If you want a directed graph, you'll have to make a couple changes in how the a
array is set up.
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