The Salamander Ferry of Kelthrace Caldera

Beyond the cinder-trail lies the lava lake of Kelthrace Caldera. The only way across is aboard the basalt rafts towed by the Ferrymaster's fire-salamanders. Each raft can bear only so much weight before it sinks into the molten rock. An expedition has formed a single line at the shore, and the Ferrymaster loads them strictly in that order.

The loading rule is fixed:

• Members board the current raft one at a time, in line order.
• A member joins the current raft if the raft's total weight, including that member, would be less than or equal to limit.
• If adding the next member would push the total above limit, the current raft departs as it is. A new raft is started, and that member is its first rider.
• Nobody ever changes place in line. A raft never skips a heavy member to take a lighter one from further back.

Write ferryLoads(weights, limit).

• weights is a list of positive integers, one per expedition member, in line order. It may be empty.
• limit is a positive integer, the maximum total weight a single raft may carry.
• Every weight is guaranteed to be between 1 and limit inclusive, so every member can always ride a raft alone.

Return a list of rafts in departure order. Each raft is a list of the weights of its riders, in boarding order. If weights is empty, return an empty list.