经典的0-1背包算法，采用动态规划法。n个重量不同，价值不等的物品，放入一个承重量固定的背包中，单个物品不能拆分，求最大价值的组合。- Classic 0-1 knapsack algorithm, using dynamic programming method. N weight is different, the value of items, into a fixed weight of the backpack, a single item can not be split,