Low Level Design, Object Oriented, Graph Data Structure, Hashmap, Interview Questions.
self.product_price = {} self.product_categories = {} self.category_products = {} Next we add the sellers and categories def addCategory(self, cat_id): # Add a category if cat_id not in self.category_products: self.category_products[cat_id] = SortedSet(key=lambda k:k[0]) def addSeller(self,