Exam question just give precise answer

  

 

A group of giants are holding their annual April feast and they are trying to determine if they can feed everyone (shocker - they probably don't have enough food). There are d dishes on the menu, where there are S, servings of dish i (1 isd). You know each of the g giant's food preferences, where giant j (1 sjg) would like to get their servings from a subset of dishes Dj C(1,..., d). Each giant is allotted up to 7 servings (they can all be of the same dish or a mixture of multiple dishes). The giants want to create a flow network and solve MAXIMUM FLOW to determine if they can feed everyone, subject to the above constraints. (a) What are the nodes in the flow network?