请将上述伪代码转换为可执行的c语言函数。
时间: 2024-02-25 21:57:01 浏览: 27
好的,以下是根据前面给出的伪代码,转换为可执行的C语言函数:
```c
#define INF 1e9 // 无穷大
typedef struct arc {
char name[20]; // 存储指向的节点
float dist; // 存储边权值
struct arc *next;
} Arc;
typedef struct Head {
char name[20]; // 存储站点名称
Arc *add; // 存储指向该节点的边的指针
float dist; // 存储距离
struct Head *prev; // 存储前驱节点
int visited; // 标记是否已确定最短路径
} Head;
Head *getNode(Head *graph, char *name) {
// 根据节点名称获取节点指针
while (graph != NULL) {
if (strcmp(graph->name, name) == 0) {
return graph;
}
graph = graph->next;
}
return NULL;
}
float distance(Head *u, Head *v) {
// 计算两节点间的距离(边权值)
Arc *arc = u->add;
while (arc != NULL) {
if (strcmp(arc->name, v->name) == 0) {
return arc->dist;
}
arc = arc->next;
}
return INF;
}
void Dijkstra(Head *graph, char *start, char *end) {
// 初始化
Head *node = graph;
while (node != NULL) {
node->dist = INF;
node->prev = NULL;
node->visited = 0;
node = node->next;
}
Head *startNode = getNode(graph, start);
startNode->dist = 0;
// 确定最小距离节点
while (1) {
float minDist = INF;
Head *minNode = NULL;
node = graph;
while (node != NULL) {
if (!node->visited && node->dist < minDist) {
minDist = node->dist;
minNode = node;
}
node = node->next;
}
if (minNode == NULL) {
break;
}
if (strcmp(minNode->name, end) == 0) {
break;
}
// 更新相邻节点距离
Arc *arc = minNode->add;
while (arc != NULL) {
Head *v = getNode(graph, arc->name);
if (!v->visited) {
float alt = minNode->dist + distance(minNode, v);
if (alt < v->dist) {
v->dist = alt;
v->prev = minNode;
}
}
arc = arc->next;
}
// 标记已确定最短路径
minNode->visited = 1;
}
// 输出路径
Head *endNode = getNode(graph, end);
if (endNode->prev == NULL) {
printf("No path found.\n");
}
else {
Head *node = endNode;
int numNodes = 0;
while (node != NULL) {
numNodes++;
node = node->prev;
}
char **path = (char **)malloc(sizeof(char *) * numNodes);
node = endNode;
int i = numNodes - 1;
while (node != NULL) {
path[i] = node->name;
i--;
node = node->prev;
}
float totalDist = endNode->dist;
printf("Path: %s", path[0]);
for (i = 1; i < numNodes; i++) {
printf(" -> %s", path[i]);
}
printf("\nTotal distance: %.2f\n", totalDist);
free(path);
}
}
```
注意,由于需要动态分配路径数组,因此需要在结束后释放内存。另外,上述代码中的链表实现方式较为简单,若要优化可采用其他数据结构。
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