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 the n kinds of goods and a backpack. The weight of the items i wi, the value of vi, the knapsack of capacity C Asked how to select the items of the loaded backpack, making the load items in the backpack the total value of?