图的邻接矩阵实现（c）

参考：算法：c语言实现 一书

图的邻接矩阵实现

#ifndef GRAPH
#define GRAPH

/*
	图的邻接矩阵实现
*/
#include<stdio.h>
#include<stdlib.h>
#include<time.h>

struct edge{
	int v;
	int w;
};

struct graph{
	int v;
	int e;
	int **adj;
};

edge EDGE(int v, int w)
{
	edge e;
	e.v = v; e.w = w;
	return e;
}

int** matrixInit(int r, int c, int val)
{
	int **t = (int**)malloc(r*sizeof(int*));
	for (int i = 0; i < r; ++i)
		t[i] = (int*)malloc(c*sizeof(int));
	for (int i = 0; i < r; ++i)
		for (int j = 0; j < c; ++j)
			t[i][j] = val;
	return t;
}

graph* graphInit(int v)
{
	graph* g = (graph*)malloc(sizeof(graph));
	g->v = v;
	g->e = 0;
	g->adj = matrixInit(v, v, 0);
	return g;
}

void graphInsert(graph* g, edge e)
{
	int v = e.v, w = e.w;
	if (g->adj[v][w] == 0) ++g->e;
	g->adj[v][w] = 1;
	g->adj[w][v] = 1;
}

void graphRemove(graph* g, edge e)
{
	int v = e.v, w = e.w;
	if (g->adj[v][w] == 1) --g->e;
	g->adj[v][w] = 0;
	g->adj[w][v] = 0;
}

int graphEdge(graph* g, edge a[])
{
	int e = 0;
	for (int v = 0; v < g->v; ++v)
		for (int w = 0; w < g->v; ++w)
			if (g->adj[v][w] == 1)
				a[e++] = EDGE(v, w);
	return e;
}

graph* graphCopy(graph* g)
{
	graph *cg = graphInit(g->v);
	cg->v = g->v;
	cg->e = g->e;
	for (int i = 0; i < g->v; ++i)
		for (int j = 0; j < g->v; ++j)
			(cg->adj)[i][j] = (g->adj)[i][j];
	return cg;
}

void graphDestroy(graph* &g)
{
	for (int i = 0; i < g->v; ++i)
		free((g->adj)[i]);
	free(g->adj);
	free(g); 
}

void graphShow(graph* g)
{
	printf("%d vertices, %d edges\n", g->v, g->e);
	for (int i = 0; i < g->v; ++i){
		printf("%2d:", i);
		for (int j = 0; j < g->v; ++j)
			if ((g->adj)[i][j] == 1) printf("%2d", j);
		printf("\n");
	}
}


#endif

　　对各个函数的简单测试：

#include"graph.h"

int main()
{
	printf("\tgraph of matrix test:\n");
	srand(time(NULL));
	graph* g = graphInit(10);
	edge e[5];
	for (int i = 0; i < 5; ++i){
		e[i].v = rand() % 10;
		e[i].w = rand() % 10;
		graphInsert(g, e[i]);
	}
	graphShow(g);
	printf("\n");

	graph* cg = graphCopy(g);
	graphDestroy(g);
	graphRemove(cg, e[1]);
	graphShow(cg);
	printf("\n");

	for (int i = 0; i < 5; ++i)
		printf("%d: %d\n", e[i].v, e[i].w);
	printf("\n");

	edge ee[10];
	int cnt=graphEdge(cg, ee);
	for (int i = 0; i < cnt; ++i)
		printf("%d,%d\n", ee[i].v, ee[i].w);
	printf("\n");


}