无向图邻接表的深度优先遍历

/*无向图邻接表的深度优先遍历*/
#include<stdio.h>
#include<stdlib.h>

#define MAX_VERTER_NUM 20

typedef struct ArcNode{    /*表节点*/
 int adjvex;      /*邻接点*/
 struct ArcNode *nextarc;   /*指向下一条弧的指针*/
}ArcNode;
typedef struct VNode{   /*头结点*/
 int data;      /*定点信息*/
 ArcNode * firstarc;     /*指向第一个依附该顶点的弧的指针*/
}VNode,AdjList[MAX_VERTER_NUM];
typedef struct{    /*图*/
 AdjList vertices;   /*顶*/
 int vexnum,arcnum;  /*图的顶点数和弧数*/
}ALGraph;

int visited[MAX_VERTER_NUM];
int n=1;

int LocateVex(ALGraph * G,int v) /*寻找节点V的位置*/
{
 int k,n;
 for(k=0;k<G->vexnum;k++){
  if(G->vertices[k].data==v){
   n=k;
   break;
  }
 }
 return n;
}

void DFS(ALGraph *G,int v)
{
 ArcNode *p;
 p=G->vertices[v].firstarc;
 if(n<G->vexnum){
  printf(" V%d -->",G->vertices[v].data);
  n++;
 }
 else{
  printf(" V%d\n",G->vertices[v].data);
 }
 visited[v]=1;
 while(p)
 {
  if(!visited[p->adjvex])
   DFS(G,p->adjvex);
  p=p->nextarc;
 }
}

void DFSVisited(ALGraph * G)
{
 int v;
 printf("\n深度优先遍历点顺序: \n");
 for(v=0;v<G->vexnum;v++)visited[v]=0;

 for(v=0;v<G->vexnum;v++)
  if(!visited[v])
   DFS(G,v);
}

void Print_ALGraph(ALGraph *G)  /*打印邻接表*/
{
 int i;
 ArcNode *a3;
 printf("\n打印无向图邻接表:\n");
 for(i=0;i<G->vexnum;i++){
  printf(" %d  V%d |",i,G->vertices[i].data);
  if(G->vertices[i].firstarc!=NULL){
   a3=G->vertices[i].firstarc;
   while(a3)
   {
    printf(" --> %d ",a3->adjvex);
    a3=a3->nextarc;
   }
  }
  printf("\n");
 }
}

void Insertadj(ALGraph * G,int i,int j)  /*插入邻接点的下标*/
{
 ArcNode *a1,*a2;
  a1=(ArcNode *)malloc(sizeof(ArcNode));
  a1->adjvex=j;a1->nextarc=NULL;
  if(G->vertices[i].firstarc==NULL){
   G->vertices[i].firstarc=a1;
  }
  else{
   a2=G->vertices[i].firstarc;
   while(a2->nextarc)
   {
    a2=a2->nextarc;
   }
   a2->nextarc=a1;
  }
}

void Init_ALGraph(ALGraph * G)  /*初始化图并建图*/
{
 int v,v1,v2,i,j,q,p;
 printf("input your vexnum and arcnum:\n");
 printf("输入(点,边): ");scanf("%d,%d",&G->vexnum,&G->arcnum);

 for(v=0;v<G->vexnum;v++){
  printf("输入点 V%d:",(v+1));
  scanf("%d",&(G->vertices[v].data));
  G->vertices[v].firstarc=NULL;
 }

 for(v=0;v<G->arcnum;v++)
 {
  printf("输入(点,点): ");scanf("%d,%d",&v1,&v2);
  i=LocateVex(G,v1);   /*v1的位置*/
  j=LocateVex(G,v2);   /*v2的位置*/
  Insertadj(G,i,j);
  Insertadj(G,j,i);
 }
 Print_ALGraph(G);
}

int main(int argc,char **argv)
{
 ALGraph G;
 Init_ALGraph(&G);
 DFSVisited(&G);
 return 0;
}