01背包是在M件物品取出若干件放在空间为W的背包里，每件物品的体积为W1，W2……Wn，与之相对应的价值为P1,P2……Pn。求出获得最大价值的方案。在本例中所有数值均为整数-01 M items in the backpack is out of a number of pieces on the space W of the backpack, the size of each item as W1, W2 ... ... Wn, corresponding to the value of P1, P2 ... ... Pn. Find the maximum value of the program. In this case, all values ​ ​ are integers