贪心算法解决背包问题：给定n种物品和一个背包。物品i的重量是Wi，其价值为Vi，背包的容量为C。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?(The greedy algorithm solves the knapsack problem: a given n item and a backpack. The weight of the item I is Wi, its value is Vi, and the capacity of the knapsack is C. How should we choose items packed into knapsack, so that the total value of goods packed into backpacks is the largest?)