C++ - čudno obnašanje dinamično alociranega polja

vozlisce * beri() {
 int x, y;
 ifstream f("graf.txt");
 f>>a;
 matrika=new int*[a];
 for (int i=0; i<a; i++) {
  matrika[i]=new int[a];
 }
 for (int i=0; i<a; i++) {
  for (int j=0; j<a; j++) {
   matrika[i][j]=0;
  }
 }
 while (!f.eof()) {
    f>>x;
    f>>y;
    matrika[x][y]=1;
    matrika[y][x]=1;
 }
 vozlisce * v = new vozlisce[a];
 for (int i=0; i<a; i++) {
     v[i].dolzina=32768;
     v[i].ime=i;
     v[i].predhodnik=-1;
     v[i].status=0;
 }
 return v;
}

(gdb) print **matrika@a@a
$5 = {{0, 0, 0, 0, 0, 0}, {0, 33, 0, 0, 0, 0}, {0, 0, 0, 33, 0, 0}, {0, 0, 0, 0, 0, 33}, {0, 0, 0, 0, 0, 0}, {0, 33, 0, 0, 0, 0}}

xxx@zzz:~/Documents/APS$ cat graf.txt
6
0       1
1       2
2       3
3       4
4       5