What is meant by subgroup here?

[owli00001]

What is meant by the last sentence in this paragraph? Does this mean that the amount of restaurants that are showed in the browsing system should be less than or equal to the customer group size?

[Xiyang]

hi,
it means the sum of all size from the foodPreferences array must be less or equal to the size in the customer group, in the appendixA there is an example, so 2 is the size of one subgroup, the customer group’s size is 8