0-1背包问题：有N件物品和一个容量为V的背包。第i件物品的花费是c[i]，价值是w[i]。求解将哪些物品装入背包可使价值总和最大。-The 0-1 knapsack problem: N items and a capacity of V backpack. Take the first I items is c[i], the value is w[i]. For which goods loaded backpack can make the value of the sum of the maximum.