DirectedGraph类的构成

const int N = 10;
int visit[N];

struct ConnectNode{ //邻接节点的坐标
    int site;
    ConnectNode* next;
};

template<typename DataType>
struct VertexNode   //顶点表
{
    DataType value;
    ConnectNode* firstEdge;
};

template<typename DataType>
class DirectedGraph{ //有向图
public:
    DirectedGraph(DataType a[], int n, int e);
    ~DirectedGraph();
    void DF(int x);
    void BF(int x);

private:
    VertexNode<DataType> v[N];
    int vNum,edgeNum;
};

构造函数

template<typename DataType>
DirectedGraph<DataType>::DirectedGraph(DataType a[], int n, int e):vNum(n),edgeNum(e)
{
    for(int i = 0; i < vNum; i++){
        v[i].value = a[i];
        v[i].firstedge = NULL;
    }

    int j,k;
    ConnectNode* s = NULL;
    for(int i = 0; i < edgeNum; i++){
        cin >> j >> k;
        s = new ConnectNode;
        s->site = k;
        s->next = v[j].firstEdge;
        v[j].firstEdge = s;
    }
}

析构函数

template<typename DataType>
DirectedGraph<DataType>::~DirectedGraph()
{
    ConnectNode *p = NULL, *q = NULL;

    for(int i = 0; i < vNum; i++){
        p = q = v[i].firstEdge;
        while(p){
            p = p->next;
            delete q;
            q = p;
        }
    }
}

深度优先遍历

template<typename DataType>
void DirectedGraph<DataType>::DF(int x)
{
    cout << v[x].value << endl;
    visit[x] = 1;

    ConnectNode *p = v[x].firstEdge;
    while(p)
    {
        if(visit[p->site]) DF(p->site);
        p = p->next;
    }
}

广度优先遍历

template<typename DataType>
void DirectedGraph<DataType>::BF(int x)
{
    int Q[N];
    int front = -1, rear = -1;
    ConnectNode* p = NULL;

    cout << v[x].value << endl;
    visit[x] = 1;
    Q[++rear] = x;
    while(front != rear)
    {
        int t = Q[++front];
        p = v[t].firstEdge;
        while (p)
        {
            if(!visit[p->site]){
                cout << v[p->site].value << endl;
                visit[p->site] = 1;
                Q[++rear] = p->site;
            }
            
            p = p->next;
        } 
    }
}