Java 拓扑排序代码
时间: 2023-12-23 11:27:35 浏览: 38
以下是Java实现拓扑排序的代码:
```java
import java.util.*;
public class TopologicalSort {
private int V; // 顶点的个数
private LinkedList<Integer>[] adj; // 邻接表
public TopologicalSort(int v) {
V = v;
adj = new LinkedList[v];
for (int i = 0; i < v; ++i)
adj[i] = new LinkedList();
}
// 添加边
void addEdge(int v, int w) {
adj[v].add(w);
}
// 拓扑排序的递归函数
void topologicalSortUtil(int v, boolean visited[], Stack stack) {
visited[v] = true;
Integer i;
Iterator<Integer> it = adj[v].iterator();
while (it.hasNext()) {
i = it.next();
if (!visited[i])
topologicalSortUtil(i, visited, stack);
}
stack.push(new Integer(v));
}
// 执行拓扑排序
void topologicalSort() {
Stack stack = new Stack();
boolean visited[] = new boolean[V];
for (int i = 0; i < V; i++)
visited[i] = false;
for (int i = 0; i < V; i++)
if (visited[i] == false)
topologicalSortUtil(i, visited, stack);
// 打印排序结果
while (stack.empty() == false)
System.out.print(stack.pop() + " ");
}
public static void main(String args[]) {
TopologicalSort g = new TopologicalSort(6);
g.addEdge(5, 2);
g.addEdge(5, 0);
g.addEdge(4, 0);
g.addEdge(4, 1);
g.addEdge(2, 3);
g.addEdge(3, 1);
System.out.println("拓扑排序结果:");
g.topologicalSort();
}
}
```
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