与图相关的算法

代码

/* c1.h (程序名) */
#include<string.h>
#include<ctype.h>
#include<malloc.h> /* malloc()等 */
#include<limits.h> /* INT_MAX等 */
#include<stdio.h> /* EOF(=^Z或F6),NULL */
#include<stdlib.h> /* atoi() */
#include<io.h> /* eof() */
#include<math.h> /* floor(),ceil(),abs() */
#include<process.h> /* exit() */
/* 函数结果状态代码 */
#define TRUE 1
#define FALSE 0
#define OK 1
#define ERROR 0
#define INFEASIBLE -1
/* #define OVERFLOW -2 因为在math.h中已定义OVERFLOW的值为3,故去掉此行 */
typedef int Status; /* Status是函数的类型,其值是函数结果状态代码，如OK等 */
typedef int Boolean; /* Boolean是布尔类型,其值是TRUE或FALSE */

#define MAX_NAME 5  /*顶点字符串的最大长度+1 */
typedef int VRType;
typedef char InfoType;
typedef char VertexType[MAX_NAME];

#define INFINITY INT_MAX
#define MAX_VERTEX_NUM 20
typedef enum{DG,DN,AG,AN}GraphKind;

typedef struct ArcCell{
    VRType adj;//顶点关系类型
    InfoType *info;
}ArcCell,AdjMatrix[MAX_VERTEX_NUM][MAX_VERTEX_NUM];

typedef struct
{
    VertexType vexs[MAX_VERTEX_NUM];
    AdjMatrix arcs;
    int vexnum,arcnum;
    GraphKind kind;
}MGraph;

代码

Status LocateVex(MGraph G,VertexType u);
Status CreateFAG(MGraph *G);
void Display(MGraph G);
Status Visit(VertexType v);
int FirstAdjVex(MGraph G,int v);
int NextAdjVex(MGraph G,int v,int w);
Status Visit(VertexType v);
void DFSTraverse(MGraph G,Status (* Visit)(VertexType v));
void DFS(MGraph G,int v);
void BFSTraverse(MGraph G, Status(* Visit)(VertexType v));

代码

typedef int QElemType;
typedef struct QNode
{
    QElemType data;
    struct QNode *next;
}QNode,*QueuePtr;

typedef struct
{
    QueuePtr front,rear;
}LinkQueue;

Status InitQueue(LinkQueue *Q)
{
    (*Q).front=(*Q).rear=(QueuePtr)malloc(sizeof(QNode));
    if(!(*Q).front)
        exit(OVERFLOW);
    (*Q).front->next=NULL;
    return OK;
}

Status EnQueue(LinkQueue *Q,QElemType e)
{
    QueuePtr p=(QueuePtr)malloc(sizeof(QNode));
    if(!p)
        exit(OVERFLOW);
    p->data=e;
    p->next=NULL;
    (*Q).rear->next=p;
    (*Q).rear=p;
    return OK;
}

Status DeQueue(LinkQueue *Q,QElemType *e)
{
    QueuePtr p;
    if((*Q).front==(*Q).rear)
        return ERROR;
    p=(*Q).front->next;
    *e=p->data;
    (*Q).front->next=p->next;
    if((*Q).rear==p)
        (*Q).rear=(*Q).front;
    free(p);
    return OK;
}

Status QueueEmpty(LinkQueue Q)
{
    if(Q.front==Q.rear)
        return TRUE;
    else
        return FALSE;
}

代码

//#include "Graphtest.h"
#include "stdafx.h"
#include "Graphtest.h"
#include "fun.h"

Boolean visited[MAX_VERTEX_NUM];
Status (*VisitFunc)(VertexType v);

int LocateVex(MGraph G,VertexType u)
{
    int i;
    for(i=0;i<G.vexnum;i++)
        if(strcmp(u,G.vexs[i])==0)
            return i;
    return -1;
}

Status CreateFAG(MGraph *G)
{
    int i,j,k;
    char filename[13];
    VertexType va,vb;
    FILE *graphlist;
    printf("please input data filename(f7-1.dat):\n");
    scanf("%s",filename);
    graphlist=fopen(filename,"r");

    fscanf(graphlist,"%d",&(*G).vexnum);
    fscanf(graphlist,"%d",&(*G).arcnum);

    for(i=0;i<(*G).vexnum;i++)
    {
        fscanf(graphlist,"%s",(*G).vexs[i]);
        printf("%s\t",(*G).vexs[i]);
    }

    for(i=0;i<(*G).vexnum;i++)
        for(j=0;j<(*G).vexnum;j++)
        {
            (*G).arcs[i][j].adj=0;
            (*G).arcs[i][j].info=NULL;
        }

    for(k=0;k<(*G).arcnum;k++)
    {
        fscanf(graphlist,"%s%s",va,vb);
        i=LocateVex(*G,va);
        j=LocateVex(*G,vb);
        (*G).arcs[i][j].adj=(*G).arcs[j][i].adj=1;
    }

    fclose(graphlist);
    (*G).kind=AG;

    return OK;
}

void Display(MGraph G)
{
    int i,j;
    char s[7],s1[3];
    switch(G.kind)
    {
        case DG:strcpy(s,"有向图\0");
            strcpy(s1,"弧\0");
            break;
             case DN: strcpy(s,"有向网\0");
              strcpy(s1,"弧\0");
              break;
     case AG: strcpy(s,"无向图\0");
              strcpy(s1,"边\0");
              break;
     case AN: strcpy(s,"无向网\0");
              strcpy(s1,"边\0");
   }

    printf("%d个顶点%d条%s的%s\n",G.vexnum,G.arcnum,s1,s);

    for(i=0;i<G.vexnum;++i)
        printf("G.vexs[%d]=%s\n",i,G.vexs[i]);
    printf("G.arcs.adj:\n");
    for(i=0;i<G.vexnum;i++)
    {
        for(j=0;j<G.vexnum;j++)
            printf("%6d",G.arcs[i][j].adj);
        printf("\n");
    }
    printf("G.arcs.info:\n");
    printf("顶点1(弧尾) 顶点2(弧头) 该%s信息：\n",s1);
    if(G.kind<2)
        for(i=0;i<G.vexnum;i++)
            for(j=0;j<G.vexnum;j++)
            {
                if(G.arcs[i][j].info)
                    printf("%5s %11s   %s\n",G.vexs[i],G.vexs[j],G.arcs[i][j].info);
            }
    else
    {
        for(i=0;i<G.vexnum;i++)
            for(j=i+1;j<G.vexnum;j++)
                if(G.arcs[i][j].info)
                    printf("%5s %11s     %s\n",G.vexs[i],G.vexs[j],G.arcs[i][j].info);
   }
}

int FirstAdjVex(MGraph G,int v)
{
    int i;
    for(i=0;i<G.vexnum;i++)
        if(G.arcs[v][i].adj!=0)
            return i;
    return -1;
}

int NextAdjVex(MGraph G,int v,int w)
{
    int i;
    for(i=w+1;i<G.vexnum;i++)
        if(G.arcs[v][i].adj!=0)
            return i;
    return -1;
}

Status Visit(VertexType v)
{
    printf(" visit %s\n",v);
    return OK;
}

void DFSTraverse(MGraph G,Status (* Visit)(VertexType v))
{
    int v;
    VisitFunc=Visit;
    for(v=0;v<G.vexnum;v++)
        visited[v]=FALSE;
    for(v=0;v<G.vexnum;v++)
        if(!visited[v])
            DFS(G,v);
}

void DFS(MGraph G,int v)
{
    int w;
    visited[v]=true;
    VisitFunc(G.vexs[v]);
    //Visit(G.vexs[v]);
    for(w=FirstAdjVex(G,v);w>=0;w=NextAdjVex(G,v,w))
        if(!visited[w])
            DFS(G,w);
}

#include "Queue.h"
void BFSTraverse(MGraph G, Status(* Visit)(VertexType v))
{
    int v,u,w;
    LinkQueue Q;
    for(v=0;v<G.vexnum;v++)
        visited[v]=FALSE;
    InitQueue(&Q);
    for(v=0;v<G.vexnum;v++)
    {
        if(!visited[v])
        {
            visited[v]=TRUE;
            Visit(G.vexs[v]);
            EnQueue(&Q,v);
            while(!QueueEmpty(Q))
            {
                DeQueue(&Q,&u);
                for(w=FirstAdjVex(G,u);w>=0;w=NextAdjVex(G,u,w))
                {
                    if(!visited[w])
                    {
                        visited[w]=true;
                        Visit(G.vexs[w]);
                        EnQueue(&Q,w);
                    }
                }
            }
        }
    }
}

代码

#include "stdafx.h"
#include "Graphtest.h"
#include "fun.h"

int _tmain(int argc, _TCHAR* argv[])
{
    MGraph g;
    CreateFAG(&g);
    Display(g);

    printf("now DFS the Graph:\n");
    DFSTraverse(g,Visit);

    printf("now BFS the Graph:\n");
    BFSTraverse(g,Visit);

    while(1);
    return 0;
}