1 /**********************************************************
  2 * Name: 邻接表(有向网)
  3 * Data: 2022.01.19
  4 * Author: 吕辉
  5 * Description: 邻接表是图的链式存储结构，由边表和顶点表组成。
  6 *              边表是对图中每个顶点建立一条单链表，表中存放
  7 *              与该顶点邻接的相关顶点和对应权值；顶点表用于存
  8 *              放图中每个顶点的信息以及指向该顶点边表的头指针。
  9 ***********************************************************/
 10 #define _CRT_SECURE_NO_WARNINGS
 11 #include <stdio.h>
 12 #include <stdlib.h>
 13 
 14 #define MAXVEX 20
 15 typedef struct ArcNode
 16 {
 17     int adjvex;/*弧尾顶点在邻接表中的位置下标*/
 18     int weigth;/*权值*/
 19     struct ArcNode* next;
 20 }ArcNode;/*边表结构*/
 21 
 22 typedef struct VertexNode
 23 {
 24     char vexdata;/*弧头顶点*/
 25     ArcNode* head;/*该顶点边表的头指针*/
 26 }VertexNode;/*顶点结构*/
 27 
 28 typedef struct
 29 {
 30     VertexNode vertex[MAXVEX];
 31     int vexnum;/*顶点总数*/
 32     int arcnum;/*边(弧)总数*/
 33 }AdjList;/*邻接表*/
 34 
 35 void Create(AdjList* G);
 36 int LocateVex(AdjList* G, char vex);
 37 void Print(AdjList* G);
 38 
 39 int main(void)
 40 {
 41     AdjList G;
 42     Create(&G);
 43     Print(&G);
 44     system("pause");
 45     return 0;
 46 }
 47 /*****************************************
 48 * Name: Creat
 49 * Call: LocateVex
 50 * Called By: main
 51 * Parameter: G 邻接表
 52 * Description: 通过构建邻接表来存储图
 53 ******************************************/
 54 void Create(AdjList* G)
 55 {
 56     int i = 1;
 57     int j = 1;
 58     int k = 1;
 59     int weight = 0;
 60     char vex1 = '\0';
 61     char vex2 = '\0';
 62     ArcNode* P = NULL;
 63     ArcNode* Pre = NULL;
 64 
 65     printf("请输入顶点数和边数(逗号分隔)：");
 66     scanf("%d%*c%d", &G->vexnum, &G->arcnum);
 67     for (i = 1; i <= G->vexnum; i++)
 68     {
 69         printf("请输入第%d个结点：", i);
 70         scanf(" %c", &G->vertex[i].vexdata);
 71         G->vertex[i].head = NULL;
 72     }
 73     for (k = 1; k <= G->arcnum; k++)
 74     {
 75         printf("请输入第%d条边的弧尾、弧头和权值(逗号分隔)\n", k);
 76         scanf(" %c%*c%c%*c%d", &vex1, &vex2, &weight);
 77         /*查找并返回顶点在邻接表中的位置*/
 78         i = LocateVex(G, vex1);
 79         j = LocateVex(G, vex2);
 80         /*链接边表结点*/
 81         P = (ArcNode*)calloc(1, sizeof(ArcNode));
 82         P->adjvex = j;
 83         P->weigth = weight;
 84         /*判断图中某顶点的指针域是否为空*/
 85         if (G->vertex[i].head == NULL)
 86         {
 87             G->vertex[i].head = P;
 88         }
 89         else
 90         {
 91             Pre = G->vertex[i].head;
 92             while (Pre->next)
 93             {
 94                 Pre = Pre->next;
 95             }
 96             Pre->next = P;
 97         }
 98     }/*for循环*/
 99 }
100 /**********************************************************
101 * Name: LocateVex
102 * Called By: Create
103 * Parameter: G 邻接表
104 *            vex 顶点
105 * Description: 查找顶点vex在顶点表中的位置下标，并返回
106 * return: 若顶点表中存在该顶点，则返回其位置下标；
107           否则返回0；
108 **********************************************************/
109 int LocateVex(AdjList* G, char vex)
110 {
111     int i = 1;
112     for (i = 1; i <= G->vexnum; i++)
113     {
114         if (G->vertex[i].vexdata == vex)
115         {
116             return i;
117         }
118     }
119     return 0;
120 }
121 /******************************************
122 * Name: Print
123 * Called By: main
124 * Parameter: G 邻接表
125 * Description: 打印所有边的信息
126 *******************************************/
127 void Print(AdjList* G)
128 {
129     int i = 1;
130     int j = 1;
131     ArcNode* P = NULL;
132     for (i = 1; i <= G->arcnum; i++)
133     {
134         P = G->vertex[i].head;
135         while (P)
136         {
137             /*弧尾顶点在邻接表中位置下标*/
138             j = P->adjvex;
139             printf("%c--%d--%c\n", G->vertex[i].vexdata, P->weigth, G->vertex[j].vexdata);
140             P = P->next;
141         }
142     }
143 }