用蛮力法和回溯法求解子集和数问题，大家可以参考借鉴一下-Use brute force method and backtracking to solve a subset of several issues, we can look for references

算法分析与设计 最大团问题 G的最大团是指G中所含顶点数最多的团。 无向图的最大团和最大独立集问题都可以看作是图G的顶点集V的 子集选取问题可以用回溯法在O(n*(2^n))时间内解决。-Algorithm analysis and design problem G, the biggest group the biggest group is the maximum number of vertices of G contained in the group. Undirect