//date:2020.4.22

//图的邻接表存储
#include <bits/stdc++.h>
using namespace std;
//首先定义结点
typedef struct Node
{
    int data;//结点的数据
    struct Node *next;
} EdgeNode; //表结点

typedef struct FirstNode
{
    int index;//表头的数据
    EdgeNode *first;//指向第一个结点的指针
} Vertex;

typedef struct grap
{
    Vertex vex[100];//表头结点
    int n,e;//图的节点数和边数
} Graph;
Graph graph;
void createGraph()
{
    //先建立顶点表，再建立边表
    printf("输入顶点数：\n");
    scanf("%d",&graph.n);
    printf("输入边数：\n");
    scanf("%d",&graph.e);
    getchar();

    cout<<"输入顶点"<<endl;
    for(int i=0; i<graph.n; i++)
    {
        cin>>graph.vex[i].index;
        graph.vex[i].first=NULL;
    }
    //输入边
    cout<<"输入边"<<endl;
    for(int i=0; i<graph.e; i++)
    {
        int a,b;
        cin>>a>>b;
        //因为要创立结点
        //在b的邻接链表上挂a
        EdgeNode *p;
        p=(EdgeNode *)malloc(sizeof(EdgeNode));
        p->data=a;
        p->next=graph.vex[b].first;
        graph.vex[b].first=p;
        //在a的邻接表上挂b
        p=(EdgeNode *)malloc(sizeof(EdgeNode));
        p->data=b;
        p->next=graph.vex[a].first;
        graph.vex[a].first=p;
    }
}
//int visited[100]= {0};

int main()
{
    //Graph G;
    createGraph();
    return 0;
}

图的邻接表存储