南邮数据结构实验3.1:邻接矩阵的初始化、撤销、边的搜索、插入、删除等操作
题目:参照程序9.1~程序9.5,编写程序,完成邻接矩阵的初始化、撤销、边的搜索、插入、删除等操作。
部分代码:
邻接矩阵的结构体定义:
//邻接矩阵的结构体定义
typedef struct{
ElemType **a; //邻接矩阵
int n; //图的当前顶点数
int e; //图的当前边数
ElemType noEdge; //两顶点间无边时的值
}mGraph;
邻接矩阵的初始化:
//邻接矩阵的初始化
Status Init(mGraph *mg,int nSize,ElemType noEdgeValue){
int i,j;
mg->n = nSize; //初始化顶点数
mg->e = 0; //初始化时没有边
mg->noEdge = noEdgeValue; //初始化没有边时的取值
mg->a = (ElemType**)malloc(nSize*sizeof(ElemType *)); //生成长度为n的一维指针数组
if(!mg->a) return ERROR;
for(i = 0;i < mg->n;i ++){ //动态生成二维数组
mg->a[i] = (ElemType*)malloc(nSize*sizeof(ElemType));
for(j = 0;j < mg->n;j ++){
mg->a[i][j] = mg->noEdge; //初始化时权重都设为-1
}
mg->a[i][i] = 0; //自回路设置为0
}
return OK;
}
邻接矩阵的撤销:
//邻接矩阵的撤销(改成了int型,有返回值),先释放一维数组,再释放指针数组
int Destory(mGraph *mg){
int i;
for(i = 0;i < mg->n;i ++){
free(mg->a[i]); //释放n个一维数组的存储空间
}
free(mg->a); //释放一维数组的存储空间
return 1;
}
邻接矩阵的边的搜索:
//邻接矩阵的边的搜索
Status Exist(mGraph *mg,int u,int v){
if(u < 0||v < 0||u > mg->n-1||v > mg->n-1 ||u == v||mg->a[u][v] == mg->noEdge) return ERROR;
return OK;
}
邻接矩阵的边的插入:
//邻接矩阵的边的插入
Status Insert(mGraph *mg,int u,int v,ElemType w){
if(u < 0||v < 0||u > mg->n-1||v > mg->n-1 ||u == v) return ERROR;
if(mg->a[u][v] != mg->noEdge) return Duplicate; //若待插入边已存在,则返回出错信息
mg->a[u][v] = w; //插入新边
mg->e ++; //增加一条边
return OK;
}
邻接矩阵的边的删除:
//邻接矩阵的边的删除
Status Remove(mGraph *mg,int u,int v){
if(u < 0||v < 0||u > mg->n-1||v > mg->n-1 ||u == v) return ERROR;
if(mg->a[u][v] == mg->noEdge) return NotPresent; //若待删除边不存在,则返回出错信息
mg->a[u][v] = mg->noEdge; //删除边
mg->e --;
return OK;
}
完整程序:
#include<stdio.h>
#include<stdlib.h>
#define ERROR 0
#define OK 1
#define Overflow 2 //表示上溢
#define Underflow 3 //表示下溢
#define NotPresent 4 //表示元素不存在
#define Duplicate 5 //表示有重复元素
typedef int ElemType;
typedef int Status;
//邻接矩阵的结构体定义
typedef struct{
ElemType **a; //邻接矩阵
int n; //图的当前顶点数
int e; //图的当前边数
ElemType noEdge; //两顶点间无边时的值
}mGraph;
//邻接矩阵的初始化
Status Init(mGraph *mg,int nSize,ElemType noEdgeValue){
int i,j;
mg->n = nSize; //初始化顶点数
mg->e = 0; //初始化时没有边
mg->noEdge = noEdgeValue; //初始化没有边时的取值
mg->a = (ElemType**)malloc(nSize*sizeof(ElemType *)); //生成长度为n的一维指针数组
if(!mg->a) return ERROR;
for(i = 0;i < mg->n;i ++){ //动态生成二维数组
mg->a[i] = (ElemType*)malloc(nSize*sizeof(ElemType));
for(j = 0;j < mg->n;j ++){
mg->a[i][j] = mg->noEdge; //初始化时权重都设为-1
}
mg->a[i][i] = 0; //自回路设置为0
}
return OK;
}
//邻接矩阵的撤销(改成了int型,有返回值),先释放一维数组,再释放指针数组
int Destory(mGraph *mg){
int i;
for(i = 0;i < mg->n;i ++){
free(mg->a[i]); //释放n个一维数组的存储空间
}
free(mg->a); //释放一维数组的存储空间
return 1;
}
//邻接矩阵的边的搜索
Status Exist(mGraph *mg,int u,int v){
if(u < 0||v < 0||u > mg->n-1||v > mg->n-1 ||u == v||mg->a[u][v] == mg->noEdge) return ERROR;
return OK;
}
//邻接矩阵的边的插入
Status Insert(mGraph *mg,int u,int v,ElemType w){
if(u < 0||v < 0||u > mg->n-1||v > mg->n-1 ||u == v) return ERROR;
if(mg->a[u][v] != mg->noEdge) return Duplicate; //若待插入边已存在,则返回出错信息
mg->a[u][v] = w; //插入新边
mg->e ++; //增加一条边
return OK;
}
//邻接矩阵的边的删除
Status Remove(mGraph *mg,int u,int v){
if(u < 0||v < 0||u > mg->n-1||v > mg->n-1 ||u == v) return ERROR;
if(mg->a[u][v] == mg->noEdge) return NotPresent; //若待删除边不存在,则返回出错信息
mg->a[u][v] = mg->noEdge; //删除边
mg->e --;
return OK;
}
int main(){
mGraph g;
int nSize,edge,u,v,i,j;
ElemType w;
printf("Please enter the size of the mgraph:");
scanf("%d",&nSize);
Init(&g,nSize,-1);
printf("Please enter the number of the edges:");
scanf("%d",&edge);
printf("Now init the graph.\n");
/*
for(i = 0;i < nSize;i ++){
for(j = 0;j < nSize;j ++){
printf("Please enter the edge:");
scanf("%d%d%d",&u,&v,&w);
Insert(&g,u,v,w);
}
}
*/
/*插入改用这个比较简单,只插入存在的边*/
for(i = 0;i < edge;i ++){
printf("Please enter the edge:");
scanf("%d%d%d",&u,&v,&w);
Insert(&g,u,v,w);
}
//delete one edge
printf("Please enter the deleted edge:");
printf("\nPlease enter the u of the edge:");
scanf("%d",&u);
printf("Please enter the v of the edge:");
scanf("%d",&v);
printf("Now search the edge:");
if(Exist(&g,u,v)) printf("OK");
else printf("ERROR");
printf("\nNow delete the edge:");
//search the deleted edge
if(Remove(&g,u,v)) printf("OK");
else printf("ERROR");
//destory
printf("\nNow destory the graph:");
if(Destory(&g)) printf("OK");
else printf("ERROR");
return 0;
}
实验结果:
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