算法 -图的深度优先遍历

 

#ifndef COMPONENT_H
#define COMPONENT_H
#include <iostream>
#include <cassert>
using namespace std;

//图的深度优先遍历
template<typename Graph>
class Component{
private:
    Graph &G;
    bool *visited;
    int ccount;
    int *id;

    void dfs(int v){
        visited[v] = true;
        id[v] = ccount;
        typename Graph::adjIterator adj(G,v);
        for(int i =adj.begin();!adj.end();i= adj.next()){
            if(!visited[i])
                dfs(i);
        }
    }
public:
    Component(Graph &graph):G(graph){
        visited = new bool[G.V()];
        id = new int[G.V()];
        ccount=0;
        for(int i=0;i<G.V();i++){
            visited[i]= false;
            id[i] = -1;
        }
        for(int i =0;i<G.V();i++)
            if(!visited[i]){
                dfs(i);
                ccount++;
                }
    }

    ~Component(){
        delete[] visited;
        delete[] id;
    }

    int count(){
        return ccount;
    }
    bool isConnected(int v,int w){
        assert(v>=0 && v<G.V());
        assert(w>=0 && w<G.V());
        return id[v] == id[w];
    }
};



#endif