queue = deque()
      
for i in range(V):           
    if in_edge[i] == 0:
        queue.append(i)
 
while queue:
      process = queue.popleft()
      results[process] = cur 
      cur -= 1
      for v in edges[process]:
          in_edge[v] -= 1
          if in_edge[v] == 0:
             queue.append(v)