improve connection deletion

handcrafted_solution.py

@@ -509,16 +509,18 @@ def delete_one_vert(vertices, vertices_3d, connections, vert_to_del):
     vertices = np.delete(vertices, idx)
   vertices_3d = np.delete(vertices_3d, idx, axis=0)
   conn_to_del = []
-  for i, c in enumerate(connections):
+  for ic, c in enumerate(connections):
     if c[0] == idx or c[1] == idx:
-      conn_to_del.append(i)
+      conn_to_del.append(ic)
+  connections = np.delete(connections, (conn_to_del), axis=0)
+  for ic, c in enumerate(connections):
     if c[0] >= idx:   
-      connections[i] = (connections[i][0]-1, connections[i][1])
+      connections[ic] = (connections[ic][0]-1, connections[ic][1])
     if c[1] >= idx:      
-      connections[i] = (connections[i][0], connections[i][1]-1)
+      connections[ic] = (connections[ic][0], connections[ic][1]-1)
   
   #print(f'del {len(conn_to_del)} connections')  
-  connections = np.delete(connections, (conn_to_del), axis=0)
+  
   connections = connections.tolist()
   #print(vertices, vertices_3d, connections)
   if vertices: