// determining paths of length 2
// from a matrix giving direct connections

for (s = 0; s < V; s++) {
   for (t = 0; t < V; t++) {
      tc[s][t] = 0;
      for (i = 0; i < V; i++) {
		 //if (s == i || t == i) continue;
         if (edges[s][i] && edges[i][t]) {
            tc[s][t] = 1;
			break;
		}
	  }
   }
}