The sample data seems dubious. What do they mean by, "good?" I imagine most of the code in that sample set is going to be a mix of completely rehearsed, "I've w

The sample data seems dubious. What do they mean by, "good?" I imagine most of the code in that sample set is going to be a mix of completely rehearsed, "I've written breadth-first search 500 times before," and complete messy hacks, "I need to cut down the number of comparisons at each node to limit the search space so I can get this in under time..."