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| struct Item { | |
| let description: String | |
| let weight: Int | |
| let value: Int | |
| let quantity: Int | |
| init(description: String, weight: Int, value: Int, quantity: Int) { | |
| self.description = description | |
| self.weight = weight | |
| self.value = value | |
| self.quantity = quantity | |
| } | |
| } | |
| //create some items | |
| var items: [Item] = [ | |
| Item(description: "Apple", weight: 2, value: 5, quantity: 1), | |
| Item(description: "Banana", weight: 8, value: 3, quantity: 1), | |
| Item(description: "Beer", weight: 4, value: 2, quantity: 1), | |
| Item(description: "Book", weight: 2, value: 7, quantity: 1), | |
| Item(description: "Camera", weight: 5, value: 4, quantity: 1) | |
| ] | |
| //max weight allowed | |
| let capacity: Int = 20 | |
| class ItemCollection { | |
| var contents: [String: Int] = [String: Int]() | |
| var totalValue: Int = 0 | |
| var totalWeight: Int = 0 | |
| func addItem(item: Item, quantity: Int) -> ItemCollection { | |
| if let value = contents[item.description] { | |
| contents[item.description] = value + quantity | |
| } | |
| else { | |
| contents[item.description] = quantity | |
| } | |
| totalValue += quantity * item.value | |
| totalWeight += quantity * item.weight | |
| return self | |
| } | |
| func copy() -> ItemCollection { | |
| let ic = ItemCollection() | |
| ic.contents = contents | |
| ic.totalValue = totalValue; | |
| ic.totalWeight = totalWeight; | |
| return ic | |
| } | |
| } | |
| var ic = [ItemCollection]() | |
| print(capacity) | |
| for i in 0..<(capacity+1) { | |
| ic.append(ItemCollection()) | |
| } | |
| print(items) | |
| for i in 0..<items.count { | |
| print(i) | |
| for j in (0..<capacity).reverse() { | |
| print(j) | |
| if j >= items[i].weight { | |
| let quantity: Int = min(items[i].quantity, j / items[i].weight) | |
| for k in 1..<(quantity+1) { | |
| let lighterCollection: ItemCollection = ic[j - k * items[i].weight] | |
| let testValue: Int = lighterCollection.totalValue + k * items[i].value | |
| if testValue > ic[j].totalValue { | |
| ic[j] = lighterCollection.copy().addItem(items[i], quantity: k) | |
| } | |
| } | |
| } | |
| } | |
| } | |
| // Remove empty last | |
| ic.removeLast() | |
| print("\(ic.last?.contents)") |
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