回溯法、分支限界法的原理，并能够按其原理编程实现解决0-1背包问题，以加深对回溯法、分支限界法的理解。 -Backtracking, branch and bound method principle, and can according to the principle of programming to realize solving knapsack problem, in order to deepen our understanding of the backtracking, branch and bound method understanding.