1.对多个链表进行操作

2.回溯法求解0/1背包

3.分枝限界法求解0/1背包

4.回溯法求解n—皇后问题

5.图的操作（邻接表表示）-1. Operate on multiple lists

2. Backtracking method for solving 0/1 knapsack

3. Branch and bound method for solving 0/1 knapsack

4. Backtracking to solve n-queens problem

5. Graph operation (adjacency list representation)