【medium】78. Subsets

求集合不重复的子集：

下面python的写法很好啊！

class Solution(object):
    def subsets(self, nums):
        """
        :type nums: List[int]
        :rtype: List[List[int]]
        """
        res = [[]]
        for num in nums :
            for temp in res[:] :
                x = temp[:]
                x.append(num)
                res.append(x)
        return res
if __name__ == '__main__':
    x=Solution()
    res = x.subsets({1,2,3})
    for r in res:
       print(r)

其他的详细参考：https://blog.csdn.net/happyaaaaaaaaaaa/article/details/51604217