给定n种物品和一背包。物品i的重量是wi，其价值为vi，背包的容量为C。问：应该如何选择装入背包的物品，使得装入背包中物品的总价值最大？-Given n types of items and a backpack. Item i of the weight of wi, the value of vi, backpack capacity C. Q: How should I choose the items into the bag, making the backpack into the