Computers and Technology, 21.03.2021 23:10 borgesalfonso12

We say that a customer C is happy if for each pizza P that C likes, there are at least two restaurants, which are located in the same area as C, that sells P. For example, if Alice likes only pizzas P1 and P2, then Alice will be happy if (1) restaurants RA and RB both sell P1; (2) restaurants RC and RD both sell P2; and (3) restaurants RA, RB, RC and RD are all located in the same area as Alice. Note that it does not matter whether {RA, RB} and {RC, RD} are the same or different set of restaurants. Find all happy customers. Exclude customers who do not like any pizza.

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