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前面我们讨论过图的基本结构是什么样的。它可以是矩阵类型的、数组类型的，当然也可以使指针类型的。当然，就我个人而言，比较习惯使用的结构还是链表指针类型的。本质上，一幅图就是由很多节点构成的，每一个节点上面有很多的分支，仅此而已。为此，我们又对原来的结构做了小的改变：
typedef struct _LINE
{
int end;
int weight;
struct _LINE* next;
}LINE;
typedef struct _VECTEX
{
int start;
int number;
LINE* neighbor;
struct _VECTEX* next;
}VECTEX;
typedef struct _GRAPH
{
int count;
VECTEX* head;
}GRAPH;
typedef struct _LINE
{
int end;
int weight;
struct _LINE* next;
}LINE;
typedef struct _VECTEX
{
int start;
int number;
LINE* neighbor;
struct _VECTEX* next;
}VECTEX;
typedef struct _GRAPH
{
int count;
VECTEX* head;
}GRAPH; 为了创建图，首先我们需要创建节点和创建边。不妨从创建节点开始，
VECTEX* create_new_vectex(int start)
{
VECTEX* pVextex = (VECTEX*)malloc(sizeof(VECTEX));
assert(NULL != pVextex);
pVextex->start = start;
pVextex->number = 0;
pVextex->neighbor = NULL;;
pVextex->next = NULL;
return pVextex;
}
VECTEX* create_new_vectex(int start)
{
VECTEX* pVextex = (VECTEX*)malloc(sizeof(VECTEX));
assert(NULL != pVextex);
pVextex->start = start;
pVextex->number = 0;
pVextex->neighbor = NULL;;
pVextex->next = NULL;
return pVextex;
}
接着应该创建边了，
LINE* create_new_line(int end, int weight)
{
LINE* pLine = (LINE*)malloc(sizeof(LINE));
assert(NULL != pLine);
pLine->end = end;
pLine->weight = weight;
pLine->next = NULL;
return pLine;
}
LINE* create_new_line(int end, int weight)
{
LINE* pLine = (LINE*)malloc(sizeof(LINE));
assert(NULL != pLine);
pLine->end = end;
pLine->weight = weight;
pLine->next = NULL;
return pLine;
} 有了上面的内容，那么创建一个带有边的顶点就变得很简单了，
VECTEX* create_new_vectex_for_graph(int start, int end, int weight)
{
VECTEX* pVectex = create_new_vectex(start);
assert(NULL != pVectex);
pVectex->neighbor = create_new_line(end, weight);
assert(NULL != pVectex->neighbor);
return pVectex;
}
VECTEX* create_new_vectex_for_graph(int start, int end, int weight)
{
VECTEX* pVectex = create_new_vectex(start);
assert(NULL != pVectex);
pVectex->neighbor = create_new_line(end, weight);
assert(NULL != pVectex->neighbor);
return pVectex;
} 那么，怎么它怎么和graph相关呢？其实也不难。
GRAPH* create_new_graph(int start, int end, int weight)
{
GRAPH* pGraph = (GRAPH*)malloc(sizeof(GRAPH));
assert(NULL != pGraph);
pGraph->count = 1;
pGraph->head = create_new_vectex_for_graph(start, end, weight);
assert(NULL != pGraph->head);
return pGraph;
}
GRAPH* create_new_graph(int start, int end, int weight)
{
GRAPH* pGraph = (GRAPH*)malloc(sizeof(GRAPH));
assert(NULL != pGraph);
pGraph->count = 1;
pGraph->head = create_new_vectex_for_graph(start, end, weight);
assert(NULL != pGraph->head);
return pGraph;
} 有了图，有了边，那么节点和边的查找也不难了。
VECTEX* find_vectex_in_graph(VECTEX* pVectex, int start)
{
if(NULL == pVectex)
return NULL;
while(pVectex){
if(