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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define MAX_CONNECTIONS 50
#define MAX_NODES 50
typedef struct node
{
char name[32];
int links;
struct node *link[MAX_CONNECTIONS];
} Node;
static Node node[MAX_NODES] = {0};
static int nodes = 0;
static Node *start = NULL;
static Node *end = NULL;
static char *ReadLine(char *p, size_t size, FILE *fp)
{
if ((p=fgets(p, size, fp)))
{
size_t l = strlen(p);
while(l && p[l-1] == '\n')
{
p[--l] = 0;
}
}
return p;
}
static Node *GetOrAddNode(const char *name)
{
int f;
for(f = 0; f < nodes; f++)
{
if (strcmp(name, node[f].name) == 0)
{
return node + f;
}
}
if (f == MAX_NODES)
{
fprintf(stderr, "Too many nodes\n");
exit(1);
}
strcpy(node[f].name, name);
return node + f;
}
static void Link(Node *node1, Node *node2)
{
node1->link[node1->links++] = node2;
node2->link[node2->links++] = node1;
}
int main(void)
{
char buff[4096];
start = GetOrAddNode("start");
end = GetOrAddNode("end");
while(ReadLine(buff, sizeof buff, stdin))
{
Node *node1, *node2;
char *p;
p = strtok(buff, "-");
node1 = GetOrAddNode(p);
p = strtok(NULL, "-");
node2 = GetOrAddNode(p);
Link(node1, node2);
}
return 0;
}
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