Trying to solve the classical NP-hard problem, the Knapsack problem: which items to steal from the hotel room. The 3D television of a vintage that would be considered “probably too old” for a whisky? The water boiler capable of making almost an entire cup of tea at a time? What looks like an ancient cellphone hooked into the wall with a wire? The unmatched towels? The iPad mini? Wait, that’s mine anyway.