void ReadGraph(struct graph *G, const char *filename)
{
        FILE *fp;
        char *s, *q, line[128];
        long lval;
        int nv, i, j;
        struct edge *e;

        fp = fopen(filename, "r");
        if (!fp) {
                printf("Den yparxei to arxeio %s\n", filename);
                exit(2);
        }

/*      H prwth grammh einai o ari8mos twn kombwn */

        s = fgets(line, 128, fp);
        lval = strtol(s, 0, 10);
        nv = (int) lval;

        if (nv < 1 || nv > MAXVERTS) {
                printf("Mh dekth timh gia ton ari8mo twn kombwn\n");
                exit(2);
        }
     }
        }

/*      H prwth grammh einai o ari8mos twn kombwn */

        s = fgets(line, 128, fp);
        lval = strtol(s, 0, 10);
        nv = (int) lval;

        if (nv < 1 || nv > MAXVERTS) {
                printf("Mh dekth timh gia ton ari8mo twn kombwn\n");
                exit(2);
        }
/*
 *      Ka8e mia apo tis epomenes nv grammes periexei tis akmes tou grafou
 *      kai to kostos metabashs apo ton ena kombo ston allo
*/
        int A[nv][nv]; //O pinakas prosptosis!
        
        for(i = 0; i < nv; i++)
               A[i][i]=0;       
        
for(i = 0; i < nv; i++){
       G->firstedge[i] = 0;
  A[i][i]=0;       
        
for(i = 0; i < nv; i++){
       G->firstedge[i] = 0;
       
        s = fgets(line, 128, fp);

        for(j=0; j<nv; j++){
                lval=strtol(s, &q, 10);
                if(q!=0){
                        e->endpoint = j;//telos akmis
                        e->cost = (int) lval;
                        e->next = G->firstedge[i];
                        G->firstedge[i] =e;
                
                        s = q;  
                }
        }
}
        G->nverts = nv;
}