The Gloamwood Hunts of the Ashen Lance

The Ashen Lance, a company of monster-hunters out of Bitwick, has been offered a season's worth of commissions in the Gloamwood: a barrow-hound to run down here, a nest of mire-drakes to burn out there. Each commission names the first and last day of the hunt and the bounty the Margrave will pay for it. The company rides as one band, so it can work only one hunt at a time, and a hunt it takes must be seen through from its first day to its last.

The company's quartermaster wants to know the most silver the Lance can earn this season.

Write bestBounty(hunts).

• hunts is a list of commissions, each a list of three integers [start, end, bounty], with 1 <= start <= end and bounty >= 1. The company is occupied on every day from start to end, inclusive. The list may be empty and is in no particular order. Two commissions may be identical.
• The company may take any subset of the commissions, provided no two chosen commissions share a day. Two commissions can both be taken only if one's end is strictly less than the other's start.
• Return an integer: the largest possible sum of bounties over such a subset. If hunts is empty, return 0.